Where does “Fitzwilliamite” come from?

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

Fitzwilliamite (English): A supporter of whig leader William Fitzwilliam, 4th Earl Fitzwilliam, especially his views on the need for parliamentary reform and Catholic emancipation

Definitions

  1. A supporter of whig leader William Fitzwilliam, 4th Earl Fitzwilliam, especially his views on the need for parliamentary reform and Catholic emancipation

Ancestry of “Fitzwilliamite”, step by step

StepLanguageWordMeaning
1EnglishFitzwilliamOS grid ref SE4115
2EnglishFitz-Son of; especially used for the illegitimate sons...
3Anglo-NormanfitzAlternative form of filz
4Old Irishdu-
5SiciliandiUsed to indicate possession, after the thing owned and before the owner; of; ’s
6Latinof; concerning; about
7Latinpostbehind; after, since, besides, except; behind,...
8Latinposteablative singular of postis
9Proto-Italicpostibehind, after
10Proto-Indo-Europeanpóstiafter
11Proto-Indo-Europeanpósafterwards, post; by, at
Every word from Proto-Indo-European pósEvery word from Proto-Indo-European póstiEvery word from Proto-Italic posti