Coos is a Dutch diminutive of the name Jacob. It belongs to a family of short, informal Dutch variants that also include Cobus, Kobus, and Koos. These forms arose as affectionate or colloquial shortenings of the longer biblical name, and Coos in particular is used primarily in the Netherlands, though it is not among the most common Dutch given names today. Etymology Coos ultimately derives from the Hebrew name Yaʿaqov (Jacob), which is traditionally explained as meaning “holder of the heel” or “supplanter,” based on the biblical story in Genesis 25:26 where Jacob was born grasping the heel of his twin brother Esau, and later supplanted him. Another theory suggests it may come from a hypothetical name Yaʿaqovʾel, meaning “may God protect.” The name entered Dutch through Latin Iacob, and over time, several nicknames and shortened forms emerged, including Coos. Notable Bearers While Coos is not widely known internationally, it has been used occasionally in the Netherlands and among Dutch-speaking communities. It is more often encountered as a surname than as a given name in modern times. For example, Dutch footballer Coos van de Water (born 1969) played for several Dutch clubs, though his fame is modest. The variant Koos is more popular, borne by figures like Koos van der Westen, a Dutch-American inventor of flamenco guitar accessories. Usage and Cultural Context In Dutch naming traditions, diminutives ending in -s (such as Coos, Koos, and Keess) were frequently used for boys during the 18th and 19th centuries. Over time, some of these evolved into independent given names, though Coos remains relatively rare today. In the province of Friesland, the variant Koos is common, but Coos is less regionally concentrated. Unlike the English form Jacob, which enjoyed great popularity in the United States, Coos never achieved widespread use. Meaning: “Supplanter” or “holder of the heel” (via Jacob) Origin: Hebrew via Latin, transmitted through Christian onomastics Type: Diminutive nickname for Jacob Usage Regions: Mainly Netherlands; occasional use in former Dutch colonies such as Suriname and Indonesia.