There are effectively no 5-letter Roblox usernames left for brand-new claims, according to the sources I found, with multiple community discussions saying the space was already exhausted and one article stating Roblox hit the 5-letter limit years ago.

What that means

The total number of possible 5-letter usernames is 265=11,881,37626^5=11,881,376265=11,881,376, but Roblox’s available pool for plain 5-letter names appears to have been fully taken up. In practice, that means finding a completely new, all-letter 5-character name is extremely unlikely right now.

What still works

  • Add a number or symbol.
  • Use 5 characters instead of 5 letters.
  • Try a slightly longer name with a clean style.
  • Use mixed casing or a nickname-based idea.

Fast answer

If you mean pure 5-letter usernames , the answer is basically 0 left in normal use. If you mean 5-character names , there may still be some, especially with numbers or special characters.