The surname O'Kelly is written Ó Ceallaigh in Irish, so it's already in 'Gaelic'.
The Ceallaigh part means 'of Ceallach', a male name.
In Irish ,Ó Ceallaigh (Kelly)ban-ghaiscíoch / banlaoch
The surname Kelly is usually Ó Ceallaigh in Irish. This derives from theforename Ceallach. The diminutive male form Ceallán and the diminutive female form Ceallsach were also found.
It should be spelled Ó Ceallaigh which is the original Irish Gaelic for O'Kelly. It is thought to mean 'bright-headed'.
Fiachra Ó Ceallaigh was born in 1933.
The name seems to be the English 'Jason' most often.Jason Kelly becomes Jason Ó Ceallaigh, for instance.Less common is Iason.
Diarmaid mac Tadgh Ua Ceallaigh died in 1065.
E amann O Ceallaigh has written: 'I dTreo Siollabas Teanga Gaeilge'
gaelic
You can't; it has no Gaelic equivalent
No Gaelic version of the name.
"Acceptance in Scottish Gaelic."
mac in Irish and Scottish Gaelic.