The name Dunbar is more commonly a baby boy's name of two origins: Gaelic and Irish. It is a location on the north sea coast near Edinburgh called Dùn 'Fort' and 'Barr 'Top Summit.' The surname was first found in the barony of Dunbar in the Lothians, where people of Irish origin regard the meaning of Dunbar as 'caste headland'. This is a rarely used name in the US. Try finding a name like this that is rarely used in the US. It is a name that has not been used for about a hundred-plus years.