<lann> 'enclosure' + <Stevan> personal name + <koth> 'old'
Historic forms:
Lanscavetone 1086
The canons of Sanctus Stefanus 1086
S. Stephan 1175
S. Stephan 1259
The upper church of Sanctus Stephanus of Lanstaveton 1259 {full entry from Pol}
Seint Estevene 1269
S. Stephan 1284
S. Stephan 1291
S. Stephan 1355
S. Stephan 1389
S. Stephan 1402
Seint Stevenys 1413
Seyntstevens 1427
St Stephens 1584