Jalvanica sounds like a code name, so I did some digging, and it seems like a robert Jelly codename of JEL.

This patent by the Hill Co., which sold his creations, also lists JELvanica:

patents.google.com/patent/USPP5635P/en

In an Israeli data sheet, both JELvanica and the rose bred from it are listed next to Jelly and Meilland roses, so there is likely some association, but no concrete proof, other than they list no parents for JELvanica, except that was released the same year as 'Parfait', JELcondir, and JELrandoli, which was 1977. They state their source as ILARO, but I don't know what that stands for. Another Israeli publication from the govt. states ILARO is the name of a holder. Maybe that means who owns the rights for release in Israel. I'm not sure, but it seems to relate to the floral industry.

Is Bob Jelly the same as Robert Jelly? Seems likely.