Irish
Hello, terribly sorry to bother you. I was looking at some Gaelic words and saw that you had edited some of them, and remembered you from the Germanic entries. I was curious about the language called "Primitive Irish", which seems to have a dearth of inscriptions. I was wondering if you could tell me more about it as it seems interesting and what's more related to Common Celtic. I have often seen Celtic cognates on Germanic and Scandinavian entries and thought checking out the ancestor of Irish could be interesting.
They don't mention any concrete sound changes or phonological changes. For example, it seems the suffix on some words was shortened going from Common Celtic/Proto Celtic to Primitive Irish (kattus to cattu), something which doesn't seem to have happened in Common Brittonic from the same period.