It is very difficult to understand what is being said on several of the gwrando categories. I played this several times and it sounds like ci not hi
I believe it's used either like 'Matilda ydy hi' - Matilda is she - She is Matilda Or 'Ydy hi eisiau bara?' - is she wanting bread? - Does she want bread?
I'm not 100% on this though, can someone smart please confirm or deny this?