Johnny Mystery Cache

Here's a word trivia puzzle that will lead you to a nano cache, placed in an easily reached spot. Bring a writing stick. Some may figure out the location without solving the puzzle, that's OK too.

"John" is a very common name; as are its translated or re-gendered derivatives like "Joan", "Juan", "Jean" and so on. Here are fifteen famous ones. Find them all, then find the cache. Along with their claim to fame, there's a hint for each one. (thanks to the daily puzzle calendar for the inspiration).

There's a geocoin for FTF, we'll figure out how to get it to you

You can validate your puzzle solution with certitude.

Congratulations to sweetpea1953 for FTS and FTF honors.