"The Isis" (/ˈaɪsɪs/ EYE-siss) is an alternative name for the River Thames, used from its source in the Cotswolds until it is joined by the River Thame at Dorchester in Oxfordshire. Notably, the Isis flows through Oxford and has given its name to several institutions and products of the city.
The modern form of the name, first recorded c.1540,[1] relates to the Egyptian goddess Isis.[2] The deity was venerated throughout the Roman Empire, and was worshipped at the Temple of Isis near the Thames in Londinium during the Roman occupation.