History:
This surnames history might be more about local naming customs and family lines than huge population shifts. Without more details about where it started and how it was used in the past, figuring out exactly how it spread is impossible.
Description:
It might be a rare name or a new one.
It might be a new name or a slightly changed version of an older one. One possibility is a slightly different spelling, like Orcho. Another is adding something to the beginning or end, like MacOrchu (if its Scottish) or Orchu-son. A third idea is looking at similar-sounding names, hinting at a shared history. Knowing where this surname comes from would help a lot!.
