Responses
I think the manhwa mentioned that royalty(or just the princes) receive new names after being promoted or growing up. So the name the manhwa mentioned before(Gyeongwon?) was probably his "childhood name" and the new name(Ehwa), was given to him cuz he became a Grand Prince. I'm not 100% sure but I do know that the whole name changing thing was mentioned somewhere in one the chapters.
bruh am i dumb or is the translation tha hard to be read- and why did she asked for their names, haven’t the manhwa mentioned the princes name in the previous chapters? what was it, seungwan-eon somehting like that?