Keil
A surname with several possible roots, including a nickname from a personal name and locational forms tied to Celtic and German place-names.
The #5,278 most common surname in the United States (2010 Census) — about 1 in every 46,758 Americans shares it.
Etymology
Keil is not a single-origin surname: historical sources attach it to several different lines. In some cases it is treated as a variant of forms such as Kyle or Kyl(e), while German Keil is also a well-known surname and word meaning “wedge.” The Manx material points to place-name elements connected with a church site or narrow path, and Irish/Welsh references show that similar-looking surnames can arise independently from different Celtic names.
History
Because the spelling is short and simple, Keil appears in records as a variant of several unrelated surnames rather than one fixed family name. It occurs in English, German, Manx, and Irish contexts, which means different bearers may have completely different origins. In census-era Britain and America, such spellings often stabilized only later, so one modern Keil line may not be related to another.
Origin
Regions
Variant spellings
Fun fact
Manx place-name studies record Keil in expressions meaning things like “narrow path” and “church/cell,” showing how local geography could shape surnames and farm names alike.
From the historical record
“p. 6t, qaotcd ^ H*liiHU. USchul JiuUccr, CR^ 5 KeiL IV. pt. JL Jiutlti, Juatyne, Jiutan, Juston.— Bapt 'theaon of Justin.' In spite iDf St. Justina and Justin Martyr, Justin wu tittle used in”
— A Dictionary of English and Welsh Surnames, with special American instances