diff --git a/plugins/pyenv-binary/README.md b/plugins/pyenv-binary/README.md
index 8e940022..5e3ba20a 100644
--- a/plugins/pyenv-binary/README.md
+++ b/plugins/pyenv-binary/README.md
@@ -16,21 +16,38 @@ and dependency metadata exist to catch that.
 
 ## Commands
 
-### `pyenv binary package <version>:<entry> --archive-base-url <url>`
+### `pyenv binary package <version>[:<entry>] --archive-base-url <url>`
 
-Installs `<version>` from source under the separate name `<entry>`, packages
-that install with `save`, then emits a python-build definition for it with
-`generate-installer`. The archive, metadata and definition land in the current
-directory, named after the entry; host the archive under `<url>` and drop the
-definition into python-build's definition directory. Keeping the entry name
-distinct from the version lets the binary sit alongside a normal source
-install of the same version.
+Installs `<version>` from source under a separate name, packages that install
+with `save`, then emits a python-build definition for it with
+`generate-installer`. With no explicit entry, the name is generated from the
+current platform, platform version and architecture. An explicit entry keeps
+the existing custom-build workflow.
 
 ```sh
-pyenv binary package 3.12.7:3.12.7-debian-12 \
+pyenv binary package 3.12.7 \
   --archive-base-url https://example.com/binaries
-# writes 3.12.7-debian-12.tar.gz, its .meta file and
-# a `3.12.7-debian-12' definition
+# On Debian 12 x86_64, writes 3.12.7-debian-12-x86_64.tar.gz,
+# its .meta file and a `3.12.7-debian-12-x86_64' definition.
+
+pyenv binary package 3.12.7:company-python \
+  --archive-base-url https://example.com/binaries
+```
+
+The archive, metadata and definition land in the current directory, named after
+the entry. Host the archive under `<url>` and drop the definition into
+python-build's definition directory.
+
+### `pyenv binary package-name <version>`
+
+Prints the automatically generated entry name without building anything. Linux
+uses the distribution name and version, macOS uses the macOS version, and other
+systems use the name and release reported by `uname`. All names include the
+architecture.
+
+```sh
+pyenv binary package-name 3.12.7
+# 3.12.7-debian-12-x86_64
 ```
 
 ### `pyenv binary save <version> [<output-dir>] [--name <name>]`
diff --git a/plugins/pyenv-binary/libexec/pyenv-binary-package b/plugins/pyenv-binary/libexec/pyenv-binary-package
index 42294ed1..88a0283f 100755
--- a/plugins/pyenv-binary/libexec/pyenv-binary-package
+++ b/plugins/pyenv-binary/libexec/pyenv-binary-package
@@ -2,18 +2,17 @@
 #
 # Summary: Create an installable binary package from a Python version
 #
-# Usage: pyenv binary package <version>:<entry> --archive-base-url <url>
+# Usage: pyenv binary package <version>[:<entry>] --archive-base-url <url>
 #
-#   Installs <version> from source under the separate name <entry>, saves it as
-#   a binary package, then emits a python-build definition for that package.
+#   Installs <version> from source under a separate entry name, saves it as a
+#   binary package, then emits a python-build definition for that package.
 #   The archive, metadata and definition are written to the current directory
 #   as <entry>.tar.gz, <entry>.meta and <entry>.
 #
 #   <version>             A version `pyenv install' knows how to build.
-#   <entry>               The name to build under and to install the binary
-#                         as, e.g. `3.13.14-debian-12'. Keeping it distinct
-#                         from <version> lets the binary sit alongside a
-#                         normal source install of the same version.
+#   <entry>               The optional name to build under and install the
+#                         binary as. If omitted, a name is generated from the
+#                         current platform, platform version and architecture.
 #   --archive-base-url <url>
 #                         Where the archive will be hosted; the definition
 #                         downloads it from <url>/<entry>.tar.gz.
@@ -49,13 +48,9 @@ if [ -z "$spec" ] || [ -z "$archive_base_url" ]; then
 fi
 
 case "$spec" in
-*?:?* ) ;;
-* )
-  echo "pyenv-binary: expected <version>:<entry>, e.g. \`3.13.14:3.13.14-debian-12'" >&2
-  exit 1
-  ;;
+*?:?* ) entry="${spec##*:}" ;;
+* ) entry="$(pyenv-binary-package-name "$spec")"; spec="${spec}:${entry}" ;;
 esac
-entry="${spec##*:}"
 
 case "$entry" in
 # `pyenv install' reads a trailing `:latest' as part of the version rather than
diff --git a/plugins/pyenv-binary/libexec/pyenv-binary-package-name b/plugins/pyenv-binary/libexec/pyenv-binary-package-name
new file mode 100755
index 00000000..7fbd9bf3
--- /dev/null
+++ b/plugins/pyenv-binary/libexec/pyenv-binary-package-name
@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+#
+# Summary: Generate a binary package name for the current platform
+#
+# Usage: pyenv binary package-name <version>
+#
+#   Prints a package name containing the Python version, platform name,
+#   platform version and architecture.
+#
+set -e
+[ -n "$PYENV_DEBUG" ] && set -x
+
+if [ "$1" = "--complete" ]; then
+  exec pyenv-install --list --bare
+fi
+
+if [ $# -ne 1 ]; then
+  pyenv-help --usage binary-package-name >&2
+  exit 1
+fi
+
+version="$1"
+
+case "$version" in
+*/* | .. | . | *[[:cntrl:]]* )
+  echo "pyenv-binary: invalid version name \`${version}'" >&2
+  exit 1
+  ;;
+esac
+
+os="$(uname -s)"
+arch="$(uname -m)"
+distro=""
+distro_version=""
+
+case "$os" in
+Linux )
+  if type -p lsb_release >/dev/null; then
+    distro="$(lsb_release -si)"
+    distro_version="$(lsb_release -sr)"
+  elif [ -r /etc/os-release ]; then
+    distro="$(. /etc/os-release && printf '%s' "${ID:-}")"
+    distro_version="$(. /etc/os-release && printf '%s' "${VERSION_ID:-}")"
+  fi
+  ;;
+Darwin )
+  distro="macos"
+  distro_version="$(sw_vers -productVersion)"
+  ;;
+* )
+  distro="$os"
+  distro_version="$(uname -r)"
+  ;;
+esac
+
+slug() {
+  printf '%s' "$1" |
+    tr '[:upper:] ' '[:lower:]-' |
+    tr -cd 'a-z0-9._-'
+}
+
+distro="$(slug "$distro")"
+distro_version="$(slug "$distro_version")"
+arch="$(slug "$arch")"
+
+if [ -z "$distro" ] || [ -z "$distro_version" ] || [ -z "$arch" ]; then
+  echo "pyenv-binary: could not determine the package platform" >&2
+  exit 1
+fi
+
+printf '%s-%s-%s-%s\n' "$version" "$distro" "$distro_version" "$arch"
diff --git a/plugins/pyenv-binary/test/package-name.bats b/plugins/pyenv-binary/test/package-name.bats
new file mode 100644
index 00000000..dadb4caf
--- /dev/null
+++ b/plugins/pyenv-binary/test/package-name.bats
@@ -0,0 +1,54 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test "completion lists installable versions" {
+  create_stub pyenv-install \
+    '[ "$*" = "--list --bare" ] && echo 3.13.14'
+
+  run pyenv-binary-package-name --complete
+  assert_success "3.13.14"
+}
+
+@test "fails without a version" {
+  create_stub pyenv-help 'echo usage'
+
+  run pyenv-binary-package-name
+  assert_failure "usage"
+}
+
+@test "rejects a second argument" {
+  create_stub pyenv-help 'echo usage'
+
+  run pyenv-binary-package-name 3.13.14 extra
+  assert_failure "usage"
+}
+
+@test "generates a package name for Linux" {
+  create_stub uname 'case "$1" in -s) echo Linux;; -m) echo x86_64;; esac'
+  create_stub lsb_release 'case "$1" in -si) echo Debian;; -sr) echo 12;; esac'
+
+  run pyenv-binary-package-name 3.13.14
+  assert_success "3.13.14-debian-12-x86_64"
+}
+
+@test "generates a package name for macOS" {
+  create_stub uname 'case "$1" in -s) echo Darwin;; -m) echo arm64;; esac'
+  create_stub sw_vers 'echo 15.5'
+
+  run pyenv-binary-package-name 3.13.14
+  assert_success "3.13.14-macos-15.5-arm64"
+}
+
+@test "generates a package name for FreeBSD" {
+  create_stub uname \
+    'case "$1" in -s) echo FreeBSD;; -m) echo amd64;; -r) echo 14.2-RELEASE-p3;; esac'
+
+  run pyenv-binary-package-name 3.13.14
+  assert_success "3.13.14-freebsd-14.2-release-p3-amd64"
+}
+
+@test "rejects an invalid version name" {
+  run pyenv-binary-package-name ../3.13.14
+  assert_failure "pyenv-binary: invalid version name \`../3.13.14'"
+}
diff --git a/plugins/pyenv-binary/test/package.bats b/plugins/pyenv-binary/test/package.bats
index 806e80da..a3d7ceb1 100644
--- a/plugins/pyenv-binary/test/package.bats
+++ b/plugins/pyenv-binary/test/package.bats
@@ -45,9 +45,18 @@ stub_build_environment() {
   assert_failure "pyenv-binary: unexpected argument \`extra'"
 }
 
-@test "rejects a bare version without an entry name" {
-  run pyenv-binary-package 3.12.7 --archive-base-url http://x/b
-  assert_failure "pyenv-binary: expected <version>:<entry>, e.g. \`3.13.14:3.13.14-debian-12'"
+@test "generates an entry name for a bare version" {
+  stub_build_environment
+  create_stub lsb_release 'case "$1" in -si) echo Debian;; -sr) echo 12;; esac'
+  cd "${BATS_TEST_TMPDIR}"
+
+  run pyenv-binary-package 3.12.7 --archive-base-url http://example.com/binaries
+  assert_success
+  assert [ -d "${PYENV_ROOT}/versions/3.12.7-debian-12-x86_64" ]
+  assert [ -f "${BATS_TEST_TMPDIR}/3.12.7-debian-12-x86_64.tar.gz" ]
+  assert [ -f "${BATS_TEST_TMPDIR}/3.12.7-debian-12-x86_64.meta" ]
+  run grep '^ARCHIVE_URL=' "${BATS_TEST_TMPDIR}/3.12.7-debian-12-x86_64"
+  assert_success "ARCHIVE_URL=http://example.com/binaries/3.12.7-debian-12-x86_64.tar.gz"
 }
 
 @test "rejects an entry name containing a slash" {