Here are some examples:
* Irish (Gaeilge): Saor (pronounced "sowr")
* Scottish Gaelic (Gàidhlig): Saor (pronounced "sowr")
* Manx (Gaelg): Saaor (pronounced "sa-or")
* Welsh (Cymraeg): Rhyddid (pronounced "rhith-thith")
* Breton (Brezhoneg): Dieub (pronounced "dee-yub")
* Cornish (Kernewek): Ryghow (pronounced "rug-ow")
Let me know which Celtic language you're looking for, and I can provide you with the specific word for "freedom"!