I dislike both, and both of them are common in Sweden but for different generations.
Ylva is more common for adult women 35 years or older, while
Alva is super common for children.
Let us step into the night and pursue that flighty temptress, adventure.
PNL: http://www.behindthename.com/pnl/45898
Top: Alice and River
Bottom: Lykke and Alvin
'Eggbert' due December 2018