Im from Slovenia, Europe. On J, here would be : Jan, Jakob, Jaka, Jost, Janez, Jurij, Jereb :)
Jayden, Jude, jack, Jordan...
Joshua and Jonathan are nice! But if you don't like any J names, don't feel like you are stuck with it! You can also go with a J sounding name like Gianni
If i had a boy i would name him either Jayden or Joshua i like those 2 names