I should have mentioned that both my Grandfathers came from Ireland. My Grandfather on my Mothers sides surname is Cellan and my surname is Sullivan which would have been O'Sullivan. O'Sullivan I believe translates
out to son of one eyed. My brother has done research on our family. I am hoping he will be able to help me in
finding our county of origin in Ireland. My wife and I (mo anam cara) are both interested in this study!

According to MacLysaght’s Surnames of Ireland, the Ó Súileabháin family originated in Tipperary, but they were pushed west during the Norman era, to Cork and Kerry, where they are numerous on both sides of the border between those counties, at the southwestern end of the island. MacLysaght says that it is clear that the first part of the name comes from súil ("eye"), but that there is disagreement as to the meaning of the latter part of the name.

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

I've split this discussion of the family name off into a new topic from a more general thread in Cúinne na bhFoghlaimeoirí - Learners' Corner:

viewtopic.php?f=7&t=397

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

It's a fairly common surname in Connamara too.

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It is recommended that you always wait for three to agree on a translation.
I speak Connemara Irish, and my input will often reflect that.
I will do an mp3 file on request for short translations.
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Ok, as far as we can trace,our family came over from Cork on my father's side. So I hope that helps with the
specific dialect. As far as Cellan is that a common surname? Thanks again for your input!

Just looking into the other half of this question and I haven't been able to find a Cellan at all. Could this name have been changed on arrival in the States?

Some similar-sounding names:

(O) Callan - Ó Cathláin
Mac Callan - Mac Cailín
Mac Kellan- Mac Coilín

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

and there is also (Mac) Kellen which is Mac Aileáin in Irish. I cant find anything on Cellan specifically though