The standard word is Daideo, vocative a Dhaideo.

Connemara Irish uses Deaideo, vocative a Dheaideo.

What forms are used in other dialects?

_________________
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).

I think it's Deaideo in Ulster too but I'm not 100% sure.

_________________
Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Athair mór, or Daid mór. A Dhaid Mhóir!

_________________
The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

I was hoping that you and An Cionnfhaolach would be answering these questions from Breandáin. I sure want to know the Munster version of all this stuff

"Daideo" is common in Munster as well. As is m' athair críonna and Daid(í) Mór

_________________

Please wait for corrections/ more input from other forum members before acting on advice