Dinosaur Comics 1581
Lots of languages have «ba» sounds for dads, too: «baba» in Persian, Swahili, Turkish and Bangla, Mandarin Chinese, «abba» in Aramaic and «ba» in !Kung. In other news, !Kung (the language AND people) is/are too awesome to just be mentioned in the title text here; their language uses CLICKS, that's what the «!» is!