https://ffxivcensus.com/2016-11/
And here are the statistics for Au Ra in 2016, a year after they came out. As you can see, they follow the same trend as Viera. Low overall player count (due to being new) but high active player count. In fact, there are more active Viera players (around 59k) a year from their release than there were female Auri a year from their release (around 33k). Au Ra have today have a higher active player count, but they have been out for longer. More people play Viera than you think.
Hrothgar even have a higher active player count (around 20k) than male Roegadyn (around 12k), despite being new and still one of the less popular player races.