Podrick Payne, a Greyjoy/Targaryen/Blackfyre/Stark/???
I always thought that there was something more to him than what meets the eye. I don’t think that I need to explain him being a Payne. For those few who might’ve forgotten his heritage, there’s always the Wiki of Ice and Fire. But the rest below….they are my theories (meaning a mix of speculations, predictions and calculated guesses)
Greyjoy:
Father may be Rodrik Greyjoy, Balon’s eldest son who was slain by Jason Mallister at the Storming of Seagard during Greyjoy’s rebellion.
It's fun to spin out these possibilities. I like your "sounds like Rodrick" lines of thinking - you never know where these rhymes might lead.
Some points I think we have to consider when deciphering Pod:
1) Payne sounds like Dayne and Reyne. Could there be parallels or symbolism in either of those Houses to explain House Payne?
2) His only known living relative is Ser Ilyn. We don't know the relationship, but what clue does this relationship provide in sorting out both Paynes?