Jojo Quiz - Manga Minor Spoilers Warning

Neostygarctus lovedeluxe is a species of tardigrade named by Japanese scientists, Shinta Fujimoto and Katsumi Miyazaki. The name is in reference to Love Deluxe as the scientists joked on how "it looked as if the Stand was controlling the creature's hair". (Source: jojowiki.com)

Jonathan's was shown when his body was in DIO's possession. Josuke4's was never shown, and got added to the anime later. Johnny's was never shown, however it did get mentioned by Lucy in the Radio Gaga Arc.

Jonathan has a total of five biological sons, George II, Giorno, Rikiel, Donatello and Ungalo.

Whitesnake can't create new stands, only take them from people.

Source: Chapter 140 - Gravity of the New Moon, Part 2

Source: Feelin' JOJO (1998) Interview - jojowiki.com

Giorno was originally intended to be a girl, but when he talked to his editor, it didn't make it to the final product. However, the ability to give life and his "feminine" names are a leftover of that. Source: JoJoveller(2013) - jojowiki.com

“ I'd say living with a positive outlook is the theme of JoJo. It's a celebration of humanity. ” —Hirohiko Araki