If you look at

Gloucestershire BDM

http://ww3.gloucestershire.gov.uk/bmd/

and search for HOPKINS - mother's maiden name WHITE

There are two listed

Frederic HOPKINS - Westbury on Severn, Newnham - 1849

and

Caroline HOPKINS - Westbury on Severn, Newnham - 1851

1851 Census, Etloe

HOPKINS

Thomas HOPKINS - 25 - Mariner
Mary Anne - 26
William - 4
Frederick - 2