There are several on the 1901 Census
Harris Alexander abt 1870 Rus Russian Subject Head East Ham Essex
Harris Alexander abt 1885 St Georges, London, England Son East Ham Essex
Harris Alexander abt 1878 Russian Subj, Russia Brother-in-law Liverpool
Harris Alexander abt 1851 Polish Subject, Poland Head Hackney London
Harris Alexander abt 1872 Pol Foreign Sub Head Mile End New Town London
Harris Alexander abt 1875 Pol, Russia Subject, Russia Head St Botolph without
The 1st or last 3 are all possible. Do you know his age ??
If you know anymore info I can look at each census page and hopefully find
the right one. Can then send you a copy.