More than likely this illegitimate birth caused the confusion with Sophia’s name.
Births Mar 1896
HALL Sophia Lockwood Norwood 4b/130
Marriages Dec 1897
LOCKWOOD Thomas Norwich 4b/462
HALL Alice Norwich 4b/462
1901 Census RG13/1842/49/24.
Living at 2 Fishers Lane, Norwich
LOCKWOOD Thomas Head Married 26 Boot and shoemaker Born Norfolk, Norwich
LOCKWOOD Alice Wife Married 25 Born Norfolk, Norwich
LOCKWOOD Sophia Dau 5 years Born Norfolk, Norwich
LOCKWOOD Hilda Dau 3 years Born Norfolk, Norwich
LOCKWOOD Thomas Son 1 year Born Norfolk Norwich
HALL Andrew Boarder 39 years Cotton waster Born Norfolk Norwich
Ten years later there were further children Andrew, Jack and Lewis and the parents stated they had been married 14 years and Sophia was 15 years old. Frank H was born in 1913.
Births Dec 1898
LOCKWOOD Hilda Eliza Norwich 4b/130
Births Mar 1900
LOCKWOOD Arthur Norwich 4b/115
Births Jun 1900
LOCKWOOD Thomas Norwich 4b/98
Births Sep 1901
LOCKWOOD Andre Mafeking Norwich 4b/172
Births Mar 1903
LOCKWOOD Jack Clement Norwich 4b/152
Births Dec 1904 [Lewis on the census]
LOCKWOOD Louis Norwich 4b/154
Births Dec 1913
LOCKWOOD Frank H [HILL] Norwich 4b/215
and
Deaths Sep 1948
LOCKWOOD Thomas 73 years Norwich 4b/425
Cando