Survey of English Place-Names

Historical Forms

• de sokna de Castre 1143–52 Newh Ed1

• socam de Castre 1155–60 Dane

• soca de Castre 1195 P 1196 ChancR 1197,1199,1201 P

• socha de Castra 1170 P 1171 P 1172 P

• soca de Castra 1197 P

• Soka de Castre 1231 Cl

• Castersoke 1510 LP

• soka de thwancastr' 1190 NCot m13

• soka de Thancastra 1200 ChR

• Swang cast' soca 1317 Inqaqd

Etymology

CAISTOR SOKE, de sokna de Castre 1143–52 (Ed1) Newh , socam de Castre 1155–60 Dane, soca de Castre 1195 P, 1196 ChancR, 1197, 1199, 1201 P et passim , socha de Castra 1170 P, 1171 P, 1172 Pet freq in P to soca de Castra 1197 P, Soka de Castre 1231 Clet passim with spellings similar to those of the parish name, Castersoke 1510 LP 1, soka de thwancastr '1190 (m13) NCot , soka de Thancastra 1200 ChR, Swang cast ' soca (sic) 1317 Inqaqd, from socn , ME  soke 'a district over which a right of jurisdiction was exercised, an estate'.