It follows the trend, yes, but the creator himself said/showed how the names should be written in English.takenoko wrote:I forgot it myself actually XD
But I'm pretty bad with names. I only remember Yuusei's since it follows the Yuugi/Yuuki pattern
Proof > http://yumeoidaku.info/Tarot/21/Atogaki03.png .
And also i remember in places, in the DM anime that the name of the main characters is written in English is written as Yugi not Yuugi.
I wont be surprised if in all the places(if there are any), where his name is written in English in the manga, its like that as well.