One needs a trademark (which the foundation has) not a copyright.

Next question if there is a possible overlap of context.

If two brands are sold in totally different areas like "cat food" and "sports cars" it can become difficult. Also depending on legislation.

I read that a Polish lemonade named "John Lemon" had to change its name after Yoko Ono interfered.

Question is if Perl it's a sufficiently big "pop star".

And the possibility to smoke Perl on a PyCon shouldn't be under estimated... ;)