Daiyousei?...No, that's different..."Dai-chan"Ah. Then you prefer Dai-chan after all?Cirno-chan, you didn't know my name?hmm?...ehWhy do you need to be told...That's what I'm called, no?Why is Dai-chanWhaat, Cirno-chan?Hey, Dai-chan"Daiyousei", therefore, Dai-chan...It's spring~...is what I'm called.No way! How on earth did you get that name?!Hmmph... Long name...Somehow, now I don't like that name either.
"Dai" for "large" is an euphemism, like "number 2" in English.Is that your name?Then, for short I'll call you "Un-ko-chan"
'Ko' here means child, and is a common character in girl names. But 'Unko' means 'shit'.