Mentioned in Brihtmaer's grant of All Hallows Church. The description is as "at Gerschereche," 1053 (Thorpe Dip. Ang. Sax. p. 372).
Other forms : "Garscherche," 34 H. III. (Anc. Deeds, A. 7315). "Grasehirche," 1307 (Ct. H.W. I. 186). These are the general forms of the name in the 13th and 14th centuries.
Is it to be identified with All Hallows Gracechurch or St. Benet Gracechurch?
The references seem to suggest St. Benet.
Derivation of name : From O.E. "gaers," "gers," "graes" = grass, a blade of grass, herb, hay.
The metathesis "er" to "re" or "ar" to "re" is of constant occurrence in the development of a language.