mapname ac_arabic already taken?

[flowtron]

Actually - the "ac_"-prefix is mostly legacy (tradition) and related largely to old-school quadropolis paradigms. I'd simply suggest you prefix your maps with your mnemonic/moniker .. so I'd call my maps "ft_*" .. that way even the most common mapnames will probably not clash.
Also - you can simply try searching on quadropolis or akimbo for these names, since the only true claim to have on a mapname would be by having published it first.