any font people here?

i downloaded 4 free fonts from the same family. each clearly different. one regular. one bold. one heavy. one black. but all 4, for some reason, were named ‘regular’ when i installed them, so the computer of course sees them as duplicates and instead of the 4 i only have 1 installed. anyone know how to rename them so i can have all 4 of them?

EDIT: im working on a mac (like why would you use any other kind of computer)