Cat with no name still!!

Just can't decide on a name for this cat do she remains called fudge. Also still unsure whether Buckley is play fighting with her or if it's more serious? How do I tell. There's no blood or injuries but I can't help feeling it doesn't look good when they do it, which seems to be a lot. Hopefully it will settle down in time and they'll be friends which was the intended purpose of getting another cat.