Cimorene

Yes, I think it was Siobhan, that rings a bell. I know the course developers a bit (who are all Welsh speaking volunteers) and I would be surprised if they didn't pay attention to things like gender balance, but I guess you never know. Also since there's a fair amount of intentional randomness in the way Duo works, I suppose it could throw all sorts of unintentional effects that should even out over time.