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Name showing in log in?
(mander.xyz)
Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian provides more than a pure OS: it comes with over 59000 packages, precompiled software bundled up in a nice format for easy installation on your machine.
I'm not on Debian, but a quick search led me to this wiki link from Arch. Give it a whirl:
https://wiki.archlinux.org/title/GDM#Hide_user_from_login_list
Edit: context of the Arch wiki link, in case better answers can be gleaned from it, I found it on AskUbuntu: https://askubuntu.com/questions/2471/how-to-hide-users-from-the-gdm-login-screen