The name certainly comes from the Gaelic element "cath", from Indo-european kéh'tus, but I'm not so sure about the "val" element, mainly because I can't find any etymology. Aside from that, you'd have to be completely fried in the brain to think that a name that has been borne by numerous chieftains and local kings of Ireland before the birth of Jesus sounds Catholic or even Christian- and even more to somehow deduce that something is Christian because it's Irish- surely Irish Gaelic was not the tongue used by Celtic pagans, as opposed to the English used by protestants and caths...
Aside from that, you'd have to be completely fried in the brain to think that a name that has been borne by numerous chieftains and local kings of Ireland before the birth of Jesus sounds Catholic or even Christian- and even more to somehow deduce that something is Christian because it's Irish- surely Irish Gaelic was not the tongue used by Celtic pagans, as opposed to the English used by protestants and caths...