name twins

[perfectworry]

There's a trope that I really like in manga where two characters share a name, or one character has taken another character's name. (Since it's old enough that this shouldn't be a spoiler any more: in Weiß Kreuz, Aya's real name is Ren and Aya is actually his sister's name. There are other examples.) This is pretty easy to show in a visual medium, but is it even possible to do in writing? How?
( Story specifics. )

xposted to wv_bookclub