Well, the jojo in giorno giovanna is pretty damn simple, just use the japanese way. Everyone obviously knows that one short form of Giorno’s name is GioGio, pronounced JioJio. But in japanese, you use ジョジョ, which will be pronounced JyoJyo(Which sounds quite similar to JioJio if you think about it. And yes, the pronunciation of JoJo in Japanese would be JyoJyo, as there is no specific symbol for ‘Jo’.), or better well known as the nickname of all Joestar descendants: JoJo.
