Forum:Forbidden Memories / Falsebound Kingdom Character Name Inconsistencies

I've noticed that characters first introduced in Forbidden Memories have their names spelled differently in Falsebound Kingdom with the only exceptions that I've noticed being "Fizdis" and "DarkNite/Nitemare." This got me curious as to which translations were more accurate, currently I'm under the impression that it's Falsebound Kingdom's as it's the only Yugioh game I've seen to spell Shimon's name as "Shimon" and not "Simon."

Name changes are as follows: Heishin/Haysheen, Secmeton/Secmayton, Atenza/Atensa, Martis/Marthis, Kepura/Kepulia, Sebek/Sebeckal and Neku/Necubetos.

I should also mention that in Dark Duel Stories and Duelist of the Roses Heishin/Haysheen is spelled as "Slysheen." Judging by the katakana (ヘイシーン) I don't think Slysheen is correct, from what I understand I think it should be pronuced as Haysheen, but the romanji would be read as Heishin, but I could be wrong.