Could be from any name beginning with 'don'
DON m English
DONA f English
DONAGH m Irish
DONAL m Irish
DONALD m Scottish, English
DONALDA f Scottish, English
DONALDINA f Scottish
DONAR m Germanic Mythology
DONÁT m Hungarian
DONAT m French, Provençal, Catalan, Polish
DONATA f Italian
DONATELLA f Italian
DONATELLO m Italian
DONATIEN m French
DONATIENNE f French
DONATO m Italian, Spanish, Portuguese
DONELLA f Scottish, English
DONELLE f
DONG m Chinese
DONKA f Bulgarian
DONNA f English
DONNACHAIDH m Scottish, Irish
DONNCHADH m Scottish, Irish
DONNIE m English
DONNY m English
DONOVAN m Irish