@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'
@vonxylofon yeah, I gotcha. I'm interested in the psychological perspective - e.g. that putting NASSAU on his uniform would not be that patriotic and that naturally in the Luxembourgish wiki he's "of Luxembourg", while in others he's not.