From Namespedia - Names Meaning and Origins
Meaning: The boy's name Donald \d(o)-na-ld\ is pronounced DAHN-ald. It is of Scottish and Gaelic origin, and its meaning is "great chief; world mighty". Donald is one of the clan names of Scotland. Linked nowadays to the cartoon duck created by Disney. Actors Donald Sutherland, Don Cheadle, Donal Logue; real estate tycoon Donald Trump; singer Donny Osmond.
Donald has 1 variant form: Donnell.