Where does “Fitzclarence” come from?

Fitzclarence (English) comes from English Fitz-, from Anglo-Norman fitz, from Old Irish du-, from Sicilian di, from Latin dē, from Latin post, from Latin poste, from Proto-Italic posti — afterwards, post; by, at.

Ancestry of “Fitzclarence”, step by step

StepLanguageWordMeaning
1EnglishFitz-Son of; especially used for the illegitimate sons...
2Anglo-NormanfitzAlternative form of filz
3Old Irishdu-
4SiciliandiUsed to indicate possession, after the thing owned and before the owner; of; ’s
5Latinof; concerning; about
6Latinpostbehind; after, since, besides, except; behind,...
7Latinposteablative singular of postis
8Proto-Italicpostibehind, after
9Proto-Indo-Europeanpóstiafter
10Proto-Indo-Europeanpósafterwards, post; by, at
Every word from Proto-Indo-European pósEvery word from Proto-Indo-European póstiEvery word from Proto-Italic posti