Hallam 

see Isabella Eagle 1838 who married a Hallam

Marriages Mar 1864 Greenwich 1d 850

Cumberland Henry

Hallam William
Sharp Jane Swanson
Thurston Charlotte

Marriages Sep 1863  Marylebone1a 799
Davis Eliza Anne
Hallam William
Hodgkin William Edward

Looked at EAGLE in GRO Image no Isabella

Marriages Sep 1864    St Geo East 1c 874

Butters George William
Hallam William
LadburyMaria
Peters Augusta

Marriages Jun 1865 

Cook Joseph Pancras 1b 24
Hallam William Pancras 1b 24
Halsted Margaret Pancras 1b 24

Looked at EAGLE in GRO Image no Isabella

Marriages Jun 1868    Marylebone 1a 828

Gilford Ann
Hallam William
Sadler Frederick
WARNESusannah

Found this Edward John 1851 Greenwich, Kent
Chas Hy Hallam        abt 1845    Greenwich, Kent, England    Son
Edwd John Hallam        abt 1842    Greenwich, Kent, England    Son
Farmer Floyd Hallam        abt 1849    Greenwich, Kent, England    Son
Jas Ed Hallam        abt 1811    Greenwich, Kent, England    Head
Martha Hallam        abt 1817    Charlton, Kent, England    Wife
HO107; Piece: 1586; Folio: 314; Page: 7; GSU roll: 174823.

Can see him with family in 1861 Then he is not with his family in 1871 so it could be he if he marries Isabella and is the Wm in 1871

1881 he is back with the family and no sign of Isabella or Maria/Maude - he is shown as married and also a clerk as William was in 1871

1861 RG9; Piece: 399; Folio: 97; Page: 45; GSU roll: 542630.

Greenwich  Kent

Chas Hallam abt 1845 Newick, Kent, England Son
Edwd J Hallam abt 1842 Newick, Kent, England Son
Farmer F Hallam abt 1848 Newick, Kent, England Son
James E Hallam abt 1811 Greenwich, Kent, England Head
Martha Hallam abt 1818 Charlton, Kent, England Wife
Ada Sargeantabt 1838 North America Servant

1871 without Edward

RG10; Piece: 753; Folio: 131; Page: 48; GSU roll: 824725.Greenwich, Kent

Charles H Hallam abt 1846 Greenwich, Kent, England Son
Frances F Hallam abt 1849 Greenwich, Kent, England Son
Louis E Hallam abt 1811 Greenwich, Kent, England Head
Marhe Hallam abt 1817 Greenwich, Kent, England Wife

1881  RG11; Piece: 720; Folio: 126; Page: 33; Line:  ; GSU roll: 1341168. Greenwich  London

Charles H. Hallen abt 1846 Greenwich, Kent, England Son
Edward J. Hallen abt 1841 Greenwich, Kent, England Son
James E. Hallen abt 1811 Greenwich, Kent, England Head

And this must be that man's death
Edward John Hallam      abt 1842      1886      Jul-Aug-Sep      Greenwich

But if he is Isabella's man - what has happened to her
Not around in 1881 when he says married
No sign of Isa* Hal??? in 1891 1901
and no logical death or marriage