Most milked franchises 

[Million]

Son1x said:

Million said:
I'm willing to bet there are more games under the Mario franchise than any other.

(this was done on VGChartz)
I did it for every franchise that got mentioned. Ofc, some are like few years old while others started back in the 80's. There are also branch franchises (like Mario Kart/Party)

Star Wars: 147
Mario: 124
Sonic: 118
FF: 97
MM: 85
NFS: 74
Dragon Ball: 73
Tony Hawk: 69
Sims: 68
Singstar: 45
Tomb Raider: 44
Resident Evil: 44
Pokemon: 42

GH: 42
MG: 35
CoD: 32
Gran Turismo: 14
Halo: 12
Mother: 4

Oh well I was off by one , shocked that there were that many Starwars games though.