“does anyone wonder what’s Vanitas’s name? in the little flashback we had

“does anyone wonder what’s Vanitas’s name? in the little flashback we had in chapter 42, he was referred as XXXX by VOTBM and I kinda sus it might be Jack, since Jun already mentioned Gilbert and Vincent in VnC, and we know that she’s making a lot references with fairy tales, wether a character or chain in PH and now, in VnC for the malnomen. so I suspect that VOTBM might have given him a name so she wouldn’t have to call him no69 and what to name a kid who’s forever cold other then Jack Frost“