
As someone who is fluent in Irish Gaelic, I just want to state that he actually pronounces Cait Sith incorrectly (though to be fair he said he wasn't certain). Cait Sith is pronounced how he originally says it, Cat Shee, and depending on the dialect (Irish or Scottish Gaelic) it's either spelled Cat/Cait Sìth (Scottish) or Cat Sidhe (Irish). It basically means Cat Fairy.