Hira-san, yes, her name is Chii in Tsubasa. She said so in third person! XD So cute! I'm pretty sure Fai said it, too, but I don't remember... *sweatdrop* But the name "Elda" has not been mentioned.
You guys wanna know how lame I am? Waaaaay back in the Outo ark, when we saw Chitose-san, I was like: "OMG OMG, she's gonna say something about Chii! She HAS to! Maybe Freya will show up, too!" And guess what never happened? Yeah, that... *vein* I really had my hopes up, back then. And here we are, nearly six volumes later with NO mention of Chii.... *sighs*