this is a statue which personifies the longest river in england. how do englishmen affectionately call it?

Father Thames, a Coade stone sculpture by John Bacon, in the grounds of Ham House

Statue of Father Thames by Raffaelle Monti at St John's Lock

The statue was commissioned in 1854 for The Crystal Palace's grounds. It was later moved to the traditional source of the Thames at Thames Head and then relocated to St John's Lock.