Board Thread:Questions and Answers/@comment-4441214-20151123041707/@comment-1909681-20151126051658

I don't think it's appropriate to write it as "Jyo" unless you're going to change every "Jo" of every character to "Jyo" (So Jyotaro, Jyosuke, Jyobin,etc.) It's simply mimicking how names are romanized on Japanese passports. It's pretty blatantly obvious that the characters are supposed to be written "Jo" hence the title "Jojo's Bizarre Adventure".