The most commonly cited answer is Azoo5573 — an early Roblox account widely referred to online as the platform’s 1 billionth user. Some later posts and videos repeat that name, while a few articles give different or conflicting claims, so the exact identity is not clearly verified by Roblox itself.

What’s known

  • The name most often associated with the milestone is Azoo5573.
  • The story circulated widely in YouTube videos and forum-style posts, which helped cement the nickname online.
  • A separate page claims a different person, Lumigamer , but that conflicts with the more widely repeated Azoo5573 story.

Practical takeaway

If you’re asking for the internet’s best-known answer, it’s Azoo5573. If you want the most careful answer, it’s that Roblox has not clearly and publicly confirmed a single definitive “1 billionth player” in the sources I found.

TL;DR: Azoo5573 is the name most people use for Roblox’s 1 billionth player, but the claim is not fully consistent across sources.