[Someone]

For the Netherlands, https://www.cbgfamilienamen.nl/nfb/index.php?taal=eng/ is a better source. It has an (IMO) better visualization and can compensate for population density. Invalshoek expect it to have better data.

(And for first names, there’s https://www.meertens.knaw.nl/nvb/english)

[gpvos]

Ah yes, I wanted to link to the Meertens Familienamenbank too, which apparently has been taken over by the CBG several years ago.