I LOOVVVEEEE
Milla but
Sisu and Saari just sounds a bit odd to me.
Irina is alright but sounds a bit dated imo. Maybe
Linnea,
Kaia, or
Liv off the top of my head.
Nikolaus is fine but if they want it to be easier to prn. or be more excepted they should use a different spelling.
Matias is fine aswell but I would prefer the Mattias spelling.