Survey of English Place-Names

Historical Forms

• Castorp 1086 DB

• Cheistorp c1115 LS

• Kaistorp 1224 FF c1270 RAii

• Keistorp Hy3 Ch 1311

• Keysthorp 1531 Yarb

• Kaystorp 1275 RH

• Kaysthorp 1271 FF 1460 Pat

• Kaystthorp' 1290 RSu

• Kayesthorpe 1347 Pat

• Kaysthorp' als Casthorp' 1533 Yarb

• Caysthorp(') 1281 Ass 1316 FA 1321 RAii 1332 SR 1352 Pat 1362 Ipm 1374,1460 Pat 1504–15 ECPxxix

• Caisthorpe 1317 1373,1376 Peace

• Caisthorpe als Castlethorpe 1705,1716,1769,1784 Yarb

• Caisthorp 1365 Pat 1529,1626 WillsStow

• Caisthorp als Castlethorpe 1716 Yarb

• Casthorp(') e14 Asw 1381 Peace 1431 FA 1464,1470,1488,1510,1512,1531 Yarb 1576 Saxton 1607 Camden

• Casthorpe 1487 Yarb 1506 Pat 1509 Yarb 1610 Speed

• Casthorpe alias Castlethrop 1659 Yarb

• Casthorpe als Castlethorpe 1697 ib

• Casthrope 1506 Ipm

• Casthrop 1510 LPi 1512 Yarb

• Castrop 1532,1538,1747 ib

• Castrop als Castlethorp 1599 1685 WillsStow

• Castrope 1535 VEiv 1536 LPxi 1575 Shef

• Castropp 1574,1614 DCLB

• Castropp als Castlethorpe 1689 Yarb

• Caistrop 1536–37 Dugdvi 1680 WillsStow 1704 FMB 1712 Yarb

• Caystroppe 1576,1625 Yarb

• Caistropp als Castlethorpp 1602 ib

• Caistroppe 1657,1724 ib

• Caisthrop als Castlethorp 1693 ib

• Caistrope otherwise Castlethorpe 1745 Foster

• Castilthorpe als Castlethorpe 1680 Yarb

• Castlethorp 1685 WillsStow

• Castlethorpe 1695 Yarb

• Castlethorpe otherwise Caisthorpe 1734 ib

• Castlethorpe otherwise Castrop 1762 ib

Etymology

The second el. is þorp 'a secondary settlement, a dependent, outlying farmstead or hamlet', no doubt of Broughton. The first el. is difficult, but Dr Insley suggests it may be a Scand byname, either ON  Keikr , from ON  keikr 'crook-backed' or ON  Keiss from Nynorsk keis 'a bend, a curve' or the adj. keis 'difficult to manage, prevail upon'. The change to Castlethorpe has not been noted before the late 16th century and presumably was due to popular etymology of the kind inferred from Pryme (1696). He wrongly believed that Castrop [was ] formerly call 'd Castlethorp and he explains the latter as being named from a great castle that was there in King John 's days , the ruins of which are now scarce to be seen , onely the place where it stood is called Castle Hill to this day .