Another expression I remember, as an answer to “thank you”, is “nà lig ar d’anàil è”.
Actually, I was going to bring up about “ceannóchaidh” being the original form; Ulster kept the /x/ or /h/ and Munster and Connachta the /o:/. Ulster, of course, shortens unstressed vowels.
unstressed ò normally is /a/ in Ulster, the -òchaidh ending is pronounced /ahi:/ in Ulster (or /ahÉ™/ before a pronominal subject).