Early-attested site in the Parish of Water Newton
- Bilingbroc 1300 Ct
- Billyngbroke 1301 Ct
- Byllingesbroke 1306 Ct
Owing to the paucity of early forms it is difficult to say whether this is from OE Billingbroc or Billingabroc or Billingesbroc when we should render it 'Billa's stream' or 'stream of Billa's people,' or 'stream of Billing' or 'of Billa's son.'