some random thoughts in the "wee small hours":
keep the Initial, so it must have been R; maybe -sohn instead of son = robinsohn => rabinsohn; Lots of russian, jewish and polish names have -ski at the end ==> robinski, RABINSKI !
Some further thoughts, after I had woken up:
If I am an emmigrant, going to a strange country, probably don't speak the language well, then I want to be near relatives.
So using the 1901 census decoder I entered surname ra*, ro* for census place Liverpool, Birth place Russia, and also for birth place Poland (as the borders changed a lot) and kept adding them together ("process search")
I then sorted by page number to get "groups living on the same page"
The bad news ? No Isaac or Eva Robinson.
The good news, a list of names for poles and russians in Liverpool:
RATNOR
ROBINSON
RADAM
RABINOWITZ
RAVINSKY
RAMANOWSKI
RAKISHIG
RAKISHEY
RALEKIN
RAMSON
RAFELOOWICH
RASSFPHIC
Hey, back up a minute ! A second look at RAVINSKY shows
Forename(s) Lastname Age PRO Age Year Born Where Born Census Place Census County Occupation
Isaac RAVINSKY 5 25 1876 Poland Russian Subject Lpool Lancashire Cabinet Maker
RAVINSKY ==> ROBINSON

Back to you - any idea, whether age or occupation fit ?
Another thought: any ideas where in Russia ? Many parts of Poland were, at different times, in Poland, Germany, Austro-Hungary or Russia