Gyrwas

According to the Old English Dictionary:

Gyrwas

pl. The people of a district in which Peterborough was situated :-- Se wæs of Gyrwa mǽgðe de provincia Gyrviorum, Bd. 3, 20; S. 550, 22. Abbud ðæs mynstres ðe gecweden is Medeshamstyde on Gyrwa[n] lande Abbas monasterii quod dicitur Medeshamstedi in regione Gyrviorum, 4, 6; S. 573, 41. v gyr a marsh. gyrwas