Cassell
Usually an English or Irish surname tied to a castle or “the castle,” with Cassell often a shortened form of Castle/Castell.
The #4,676 most common surname in the United States (2010 Census) — about 1 in every 40,694 Americans shares it.
Etymology
The surname is generally treated as a reduced or variant form of Castle or Castell, from a word meaning “castle.” In English and Norman French contexts, it likely began as a locational name for someone who lived by, worked at, or was associated with a castle. Irish surname lists also connect Cassell with Gaelic forms rendered as Cashel/Castle-like names, so in Ireland it may sometimes reflect an adapted Irish surname rather than a straight English place-name origin.
History
Bardsley and Lower both treat Cassell as belonging with Castle/Castell, and Lower explicitly calls it a shortened pronunciation of Castle. The name is recorded in medieval and later English sources, and it also appears in Irish genealogical lists, where spellings such as Cassell, Cassels, Cashel, and Castles are grouped together. Because the surname occurs in both English and Irish contexts, different families may share the same spelling but not the same precise origin.
Origin
Regions
Variant spellings
Fun fact
In older surname books, Cassell is often filed alongside a whole cluster of castle-related names, which shows how fluid spelling and pronunciation could be before modern standardization.
From the historical record
“Ireland. B.L.G. CASSELL. A shortened pronunciation of Castle? CASTELL. See Castle. CASTELLAN. The guardian of a castle. 0. Fr. chastcllan. CASTELMAN. A castellan ; constable of a castle; "keipar of the Kingis Castell." Jamieson.”
— Patronymica Britannica: a dictionary of the family names of the United Kingdom