Why is the Jane/Lisbon relationship called Jello? I don't get it.

When Ты put J/L together and say it, it sounds like Jell. I guess the "o" was added because it sounds catchier.

I've always heard of it as Jisbon, never Jello. I think Jello isn't related to Jane and Lisbon and the relationship they have, so I'm against it.

I heard because of the J/L thing...but it sounds really stupid to me. Jisbon at least makes sense and Ты don't have to spend hours thinking about it.