Complex sentence: The surname Mellan, Millan (Gaelic origin suggested as being Meallain derived from the word Meall meaning pleasant) and its downstream variants of Mallon or Mellan are very common in Ulster, particularly in the Counties of Tyrone and Armagh (Ref 7).
Split into simpler sentences: The surname Mellan, Millan (Gaelic origin suggested as being Meallain) is derived from the word Meall meaning pleasant. It's downstream variants of Mallon or Mellan are very common in Ulster, particularly in the Counties of Tyrone and Armagh (Ref 7).