Krijn and

Something that doesn't end in -ijn.
Honestly, everything fits together if you say it enough times, as they grow up, etc.

I mean.. if you have, for example, Piet and Michelle, it doesn't really fit, you'd think, but if you saw those people and lived with them, it would just fit. So just think about which name you want and not what fits (because everything fits, except ending in -ijn is a bit weird)

Boy names:
Duuk, Mats, Loet, Mels/Melle, Ties, Moos
Girl names:
Fiene, Julie, Saar, Pippa, Lize, Lune, Else

Kryn, such a lovely name!
I really like Pleun; it fits well with this name! Also Julia, Pien, Merel, Livia, Kato
Floris, Mees

Guus
Matthijs
Floris
Joep
Max
Suze
Anna
Julia
Emma