My son's first choice of a name was deemed inappropriate. It was Hacker91 (no idea why a then 8 year old would choose it but hey ho). I emailed them and they changed it to his second choice. That was a while ago though! And it was a few days in between communications from them.
Football? Never heard it - although I don't know a lot about football. Had to look up Gooner the other day...
He didn't get a notification that it was inappropriate though; I had to ask why his name wasn't showing. I completely forget where the link to contact them is, sorry. It was a few years ago - he's now 11.
dds does not either, never has and she has been on there for a long time. Hers has luv in the name so I suspect it has been blacklisted for that, they have a list of buzzwords that sets off the alarms as it were, it is automatic so the word does not have to be deliberate it can just be one that appears when you join words together IYSWIM.