Living as a (expat) Kevin in The Netherlands for many years and I've never heard this. Might be that my friends are just polite. Interested to know if this is well-known to those who grew up in The Netherlands.
Do you have an accent (preferably from the Anglosphere) that gives you away as an expat? The stigma (at least in Germany) basically doesnât apply to native English speakers (or at least much, much less so). Nobody here makes fun of Kevin Costner for being named Kevin. The stigma is specifically about lower class Germans frequently choosing certain foreign names for their kids.
Kevin does have some lingering association; the lower socio-economic class stigma is there, but not that strong. Keep in mind that for someone born in an Anglo-Saxon country, that stigma would not necessarily apply. It tends to be limited to Dutch-born folk.
Chantal on the other hand seems to carry a much stronger connotation of a lower class background.