Evidently, it derives from the Proto-Celtic *Dubno-valos, world-mighty; what Celtic given name is it?
Etymology, Etymology, and more Etymology
as well as grammar, usage, euphemism, slang, jargon, semantics (meaning), linguistics, neologism, idiom, word origin, syntax, dialect, lexicon (vocabulary), diction, pidgin, synonym, antonym, homonym, cant, argot, lingo, and redundancy.

The critically-acclaimed board game MooT consists of tough questions about the nuances of the English language.
Answer: Donald
The original name was *Dubno-valos (Proto-Celtic - the asterisk means that it is proposed, not certain), then this evolved into Domnal (Old Irish) , then Domhnall (Gaelic ), Dofnald (Scottish), and then Donald.
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