IPA: /ˈjuːsərˌneɪm/
KK: /ˈjuːsərˌneɪm/
A name used to identify a person on a computer system or online service, usually required to log in.
I created a new username for my online gaming account.
Username → It is formed from "user" (from Old French *usager*, meaning one who uses) and "name" (from Old English *nama*, meaning a word by which a person or thing is known). The word "username" refers to a name that identifies a user in a digital context.
Think of a 'user' as someone who 'uses' something, and a 'name' as what identifies them. Together, a username is the name that identifies a person using a system.