Every single time I translate something that has to do with Cirno I'm always half-tempted to leave it as Chillno (because I'm pretty sure that her name was supposed to be a pun with chill), or at the very least, as Chirno (because that's what's closer to the original pronunciation). Of course it would make no sense at this point, after more than two decades of consensus in the opposite direction. But still, it's a damn shame.

Just pretend it's an Italian "c".