Yea, Kaja is more Estonian it seems which might be why I thought it sounded a bit off. It's not a big deal either way, it was just something that didn't sound right in my mouth was all. I personally liked the way Katja sounded a bit better though its your character.
Though that does raise the question of the peculiarities of your dynasty's naming practices, with the last name of Anguish and a brother named Dante XD