This rare and interesting surname is of English origin, and is derived from the Old French "Gerin, Jerin", or the Old German "Gerin", which is a diminutive of any of the surnames which have "Ger-" as a prefix, and the suffix "-in". "Ger" is a Germanic personal name derived from "geri, gari", spear. The surname development since 1210 (see below) includes the following: Richard Gerrun (circa 1250, Cambridgeshire), John Geryn (1300 London), Robert Jeryn (1319, London), Richard Geroun (1327, Cambridgeshire) and Nicolas Yearren (1601, Worcestershire). The modern surname can be found as Yearron, Yearren, Yarron, Yarion, Gerrun, Jerren and Jerron. Among the recordings in London are the christenings of Georgius, son of Georgii and Mariae Yearron, on October 1st 1668 at St. Martin-in-the-Fields, Westminster, and of Thomas, son of Richard and Anna Maria Yearron, on January 3rd 1773 at St. Mary's, Whitechapel, Stepney. One John Yearron married Amelia Bunn on October 17th 1825 at St. Leonard's, Shoreditch, also in London. The first recorded spelling of the family name is shown to be that of Henry Girun, which was dated 1210, The Curia Regis Rolls of Cambridgeshire, during the reign of King John, known as "Lackland", 1199 - 1216. 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.