Blyde, of Taranaki, was the top try-scorer at the end of the six-tournament series, crossing the stripe 40 times, while Cantabrian Tui was a force in the forwards.
The world championship-winning pair were nominated alongside Canada's Ghislaine Landry for the award.
In the men's category, American Perry Baker shapes up as the favourite for the award, leading the men's circuit in both tries and points scored.
