That's strange, Blackbird is Éan dubh (the dhubh is a grammar thing, whether the preceding word is feminine or masculine it changes the spelling), and sounds like "ayne doo"(or duv in the other dialects). Dh makes like a g or r sound, so "druid dhubh" would sound like 'dridge-roo', druid just means close in Irish(or Ulster Irish, the rest use dún. Druid do bhéal or dún do bhéal means "shut/close your mouth," for ex
) so I'm not sure where that came from, it might be from another Celtic language because I noticed a few animals on that site are different.
Bran is actually an older term for raven, it's in Old Irish, Another Old Irish word for raven was fiach, which is where the modern one comes from, fitheach sounds like "fee-ah" in Ulster, or 'fee-ak' further down south.
Lol it is confusing. Even though they're written in the same Latin script, Celtic and Germanic languages are so different!