I think that "Clan-id" is the most common pronunciation for the series' title, but I've always said it this way, even before I even started watching the series.

I usually pronounce it like this.

i must have been saying it wrong then i guess i say mine ass clan-add...then again idk how i say it cuz i say it diff ways lol

I didn't know there were different pronunciations...mind you, I've been pronouncing it the same as an Irish new age band of the same name, so as it is Japanese it is probably different.

I don't think that there are differing pronunciations for the band, but I've heard all sorts of different pronunciations for the anime series title from fans.

It's supposed to be pronounced Clan-id. It comes from the Irish word for family; therefor one would pronounce it like the Irish.