This is an English occupational name for a pork butcher, deriving from the Medieval English "kellen" meaning "to kill" or "to slaughter" and "hog" - a "hog" or "pig". The surname from this source is first recorded in the latter half of the 13th century. Alternate spellings have included Kelehoog (1369). One John Ryche alias Kelhoge, appears in the 1541 Fine Court Rolls of Essex. In 1651 a Joseph Kellogg emigrated from Great Leighs, Essex to Connecticut. One of his descendants, William Kellogg (1830-1918) became governor of Louisiana. In the modern idiom the name has two spelling variations: Kellogg and Kellog. The first recorded spelling of the family name is shown to be that of Geoffrey Kyllehog which was dated 1277, in the "Fine Court Rolls of Essex" during the reign of King Edward, known as "The Hammer of the Scots" 1272 - 1307 Surnames became necessary when governments introduced personal taxation. In England this was known as Poll Tax. Throughout the centuries, surnames in every country have continued to "develop" often leading to astonishing variants of the original spelling.