Sulu definitely hadn't heard anything like Welsh before, and he was pretty sure his expression proved that. "That's cool, though," he said after a moment, grinning a bit, "I mean, that's something not a lot of people are going to know, right? Like, unless Welsh is all over the place or something." He didn't think it was, if his dad was being ridiculous about it or whatever. "Either way, though, it's cool."