Prosser
A Welsh surname meaning “son of Rosser,” from the older patronymic ap Rosser.
The #4,312 most common surname in the United States (2010 Census) — about 1 in every 37,451 Americans shares it.
Etymology
Prosser is generally explained as a Welsh patronymic surname from ap Rosser, meaning “son of Rosser.” Rosser is a Welsh form related to Roger, ultimately from Germanic elements meaning roughly “fame” and “spear.” In English records, the initial “ap” often fused with the father’s name, producing surnames like Prosser and related forms such as Rosser.
History
The name is well attested in Welsh and Welsh-border records, and it spread more widely into English usage as Welsh surnames became hereditary. Nineteenth-century surname scholars consistently grouped Prosser with other Welsh patronymics, especially Rosser. It remains most strongly associated with Wales and areas of Welsh settlement.
Origin
Regions
Variant spellings
Fun fact
A common pattern in Welsh surnames is the loss of ap (“son of”) as the name became fixed, leaving forms like Prosser, Pritchard, and Price.
From the historical record
“PROPERT, ^ var. of Probert, q.v. ' PROSSER \ (Celt.) for the Welsh Ap-Rosser PROSSOR J = Son of Rosser, q.v. David ap-Rosser. — Valor Eccles., temp. Hen. viii. PROST (Eng.) Priest \}A.^.prost, O.E.preSst, priest] An prostes upe londe singeth. —”
— Surnames of the United Kingdom: a concise etymological dictionary (2 vols in 1)