Meaning & origin
How it developed
In English usage, O'sullivan as a surname developed from Ó Súilleabháin.
O'sullivan’s family of names
In English usage, O'sullivan as a surname has a short form in Sullivan. In English usage, O'sullivan as a surname developed from the Irish form Ó Súilleabháin.
Inner ring: nicknames and forms · outer: across languages.
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Nicknames & forms 1
Diminutives, pet forms, short forms and variants used alongside the name.
Across languages 1
Equivalents and cognates in other languages, plus older forms it grew from.
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