There is no single language called 'Celtic'. It's like saying 'Slavic' or 'Germanic'.
It's a family of related languages.
Irish (Gaelic): Eilís or Sibéal
Scottish Gaelic: Ealasaid or Iseabail
Welsh: Elisabeth (Bethan) or Ysbail
Breton: Izabell
The Irish equivalent of Elizabeth in Irish is Eilís (elleesh)
but Sibéal (shibael) is an alternate form historically.
In Irish (Gaelic) it is Eilís;
in (Scottish) Gaelic it is Ealasaid.
Ealasaid
Eilís
Irish: Éilis
Irish Gaelic is Eilís [eleesh];Scottish Gaelic: Ealasaid [ella-setch]
Irish (Gaelic): Eilís [eleesh] (Scots) Gaelic: Ealasaid Manx/Welsh/Breton/Cornish: ?
Scottish Gaelic, Irish Gaelic, and Manx all derive from Old Irish.
In Irish d'fhíorghrá;in Scottish Gaelic: ?
No Irish Gaelic form
Gaelic football is an Irish football. Gaelic means Irish. Obviously then the Gaelic our Irish people
The Irish Gaelic for 'turbine' is TUIRBÍN; the Scottish Gaelic is TUIRBIN.
In Irish Gaelic the word for chilli is CILLÍ.
In Irish Gaelic it is diabéiteas.
In Irish Gaelic: saoirse
'Thin' is tanaí in Irish Gaelic.