I know Oda is a fan of western music and I'm pretty sure I've read he is indeed a fan of Eminem. Could very well be.
If it is a coincidence there are an awful lot of coincidences in the series.
Contains some spoilers, probably
Water 7 - Venice
Shandora - El Dorado
Warship Island - Hashima Island
Holy Land Mariejois - this place in France
Skypiea saga - Native Americans spring to mind
Little Garden - Norse mythology with the giants
Drum Island - Didn't Chopper's tale seem very familiar to you?
I guess the slavery in Sabaody Archipelago would count as well
I've probably missed out some obvious stuff but oh well.