Yeah, it's supposed to be Marl because she's not supposed to tell Crono her full name (Marldia) but she kinda slipped up and started to say it anyway. I think it's difficult to understand though because there's a pause where you get to name her...and because the English version of her full name is a completely different name altogether...It kinda ruins the running joke in the beginning of the game of Crono being kinda oblivious about it (though I suppose you could play it as being that he just doesn't care, but what's the fun in that?).