Hello, I noticed that the user-submitted surname "Sizemore" is lacking an etymology.
I remember having read a few years ago (while researching my genealogy) that "Sizemore" had come from "Cismor," a Portuguese Sephardic-Jewish alteration of the Hebrew given name–turned–surname "Sisamai" < "Sismai." This name was apparently one among several crypto-Jewish surnames in Portugal and Spain, altered to conceal their bearers' religion and ethnicity from the public, after forced conversion and other persecution.
"Sismai" appears in the Hebrew Bible / TaNaKh / Old Testament: namely 1 Chronicles 2:40. I can only find a couple webpages listing meanings for the name, but they seem to agree on "house" and "blindness."