Early-attested site in the Parish of Wykeham
- Rostun(e) 1086 DB 1208 Ass
- Ruston 1167 P 1393,1450 Test
- Roston(a) c.1190–9 YCh 1226–8 Fees 1408 For
- Royston 1287 Ipm
Professor Ekwall suggests that this name contains OE hrōst , 'roof-beam,' but the sense of the compound is obscure. v. tun .