Hans Bahlow in his "Dictionary of Germany Names" and translated by Edda Gentry (Madison, Wisconsin: Univ. of Wis-Madison, 1993), 641 pp. +xliv. Edna Bahlow of Hamburg, Ger. holds the German copyright of 1967. On page 120:ESCH derives from a place name or locality name. It refers to a dwelling place.It was found as "Lubbert von den Esch" in the Lower Rhine in 1550."Lubbert from the Ash tree". Thus, those who first took Esch as a surname dwelled by an ash tree.Escher means one who lived near an ash tree. Eschle is a for of Esch found in Swabia.Today parts of Wuerttemberg and Bavaria.The "le" is merely an affectionate ending. I have found "le" on the end of many names in the area of the eastern Schwarzwald.