Yeah there's something like that going on with the USA AFL search trends, because AFL out ranks Major League Soccer too which is incredibly unlikely. I would say you are on the money there with it being a mistaken search rather than a deliberate.
Further evidence to this is that both 'Rugby League' and 'Australian Rules Football' show negligible results.
It's hilarious watching you trying to explain google and trends when your complete misunderstanding of them saw you thinking that the Warriors are bigger in NZ than the All Blacks, and Inter Miami and Wrexham were in the 10 most popular teams in NZ.