History:
Captain: This surnames spread likely involved people choosing to move and others being forced to move. Those who chose to move might have been traders, explorers, or soldiers, settling in new places. Forced moves, maybe from wars or other problems, could explain why this surname shows up in unexpected locations. Where this surname ended up depends on what happened historically and why people moved. Looking at old records about ships, wars, and population changes related to this surname would give a clearer picture.
Description:
Some families might use this surname because an ancestor held that title, but it wouldnt tell you anything about their ethnicity or background. Its just too common a title to be useful for that.
