Okay I posted this last night..
But it's too interesting not to post it again (rips pink hair out). The fact Yylfordt's name is entirely Latin base, including Chinese and Japanese that are derive from Latin. When romanized, the pronunciation of the name can go either of said spelling (which spelling gets tossed out the window), thus uniquely spelled name Yylfordt conclude on the spelling and pronunciation. But it also have to do with his fight with Tsumugiya Ururu as well in the beginning of the arc. Commence beef and car jokes, and English is very messy as Yylfordt's name.
Bleach Name Translations & Meanings (Updated)