@vonxylofon
it's interesting how Wikipedia has different opinions on this:
- Henri has no 'last name' on EN, NL, FR, PT, PL, TR, ZH wikis
- he's "of Luxembourg" in the Luxemburgisch, ES wikis
- on the Luxemburgisch wiki the House of Nassau does not have an article
- on DE wiki he's 'Henri ... von Nassau' and the RU wiki replicates that
- on FR wiki it's 'de Nassau' in the info box
- IT wiki gives all titles in the info box in 'altri titoli'