In Wigtownshire, the name McCulloch Clan McCulloch appears on very early documents, i.e.
Barony of Achowane & Baronia Killasser On 7 July 1618 William McCulloch of Mertoun (Myretoun McCulloch Torhous in Mochrum Parish), with the consent of his eldest son Alexander, ratified a charter of Killasser in the barony of Achowane to William Houston and his wife Katherine Vaus.