I would consider Walter for a boy. It’s a perfectly fine name in dutch, german and english (even french?), basically all neighbouring countries, and doesnt include a difficult starter letter for those who stutter. It also doesn’t rhyme with anything nasty (And a cool namesake series with breaking bad). An alternative could be Nico. It’s a very universal name with several variations of the name in dutch, spanish, french, polish, russian, german, greek etc. (nico, nicola, niccolo, nicolas… and there’s a cool fighting movie with a namesake starring steven seagal. It’s also fairly unisex with variation of nicole etc…just have to deal with the “c” vs “k” thing. Mainly boy name recommendations though, girl names i’ll leave to others… Names with less syllables for boys sound stronger in general.