Dunnett

* As a Scottish surname, variant of Dunnet, a place in Caithness, Scotland, probably from Scottish Gaelic dùn (“fortress, stronghold”). * As an English surname, from the Old French surname Donat, from Latin Donatus (see Donat). * Also as an English surname, from the placename Downhead in Somerset or several places called Donhead, both from Old English dūn (“hill, down”) + hēafod (“head end”).

来源：wiktionary