There were a lot of baby Kylos last year. The name jumped the popularity ranks from #3269 in 2015 to #901 in 2016, according to the U.S. Social Security Administration. So it’s not incredibly popular (to contrast, Ben was #704, and Benjamin is #6) but it is getting more popular. And note – it’s still less popular than Anakin, which is #778, up from #910.
At #175 Finn is the most popular sequel-trilogy related name associated with a major character – but it’s in been in wide use and gaining in popularity for more than a decade now, so we can’t peg that to Star Wars alone. Rey hasn’t shown any major growth, though it did jump from 904 to 868 (though as a male name – it’s not in the top 1000 for girls.)
As for the old standbys, Leia is #321, while Luke is #29. Poe, Han, Padme and Armitage (I had to look it up just for kicks) are all unranked.
StarWars.com has officially annouced that Force Friday II is set for September 1, but more importantly (for our purposes) they’ve also given us our first look at Rey, Finn and Poe in The Last Jedi. Rey is not only front and center with a lightsaber, but she’s sporting a new hairstyle! Finn has a new shirt! Poe looks… Pretty much the same!