SHOCKER!! Jay Z Names His DAUGHTER . . . AFTER HIS EX-GIRLFRIEND!!!!

Jay Z and Beyonce welcomed their first child together, a daughter named IVY BLUE into the world.

And we're told that BEYONCE chose the name "Ivy" and Jay chose the name "Blue". Soooo . . . . why is Jay Z's LAST GIRLFRIEND (before dating Beyonce) named BLU CANTRELL!!!

Is it too late for a NAME CHANGE????