noun
Computing term for a name used to identify a user on a system or service.
ログインするには利用者名とパスワードが必要です。
A user name and password are required to log in.
Synonymous loanword from English; more common in casual or tech-savvy contexts, while 利用者名 is a native Japanese compound often seen in formal or official interfaces.
Compound of 利用者 (user) + 名 (name).