Donald Look up Donald at Dictionary.com
surname, from 13c. Scottish Dofnald, Dufenald, probably from Gaelic Domhnall, Old Irish Domnall (pronounced "Dovnall"), from Proto-Celtic *Dubno-valos "world-mighty, ruler of the world," from *walos "ruler" (see valiant) + Old Irish domun "world," from PIE root *dheub- "deep, hollow," via sense development from "bottom" to "foundation" to "earth" to "world" (see deep (adj.)).