History:

Many surnames change naturally over time, often without clear records of big population shifts. This surnames distribution likely reflects smaller, undocumented family or individual movements – maybe due to jobs, marriages, or just people moving over many years. Tracing this surnames history needs serious genealogical digging and access to old records. Without that, figuring out specific migrations is tough.

Description:

Maybe its just a slightly different spelling, like Kuyla. Or, it could have extra letters added on the end, like Kuilyas (which might mean more than one person with this surname) or Kuilyev (a type of name showing family history). We could also guess it comes from a nickname or an old place name, but without knowing where this surname comes from, thats just a guess.