7 children.
I'm sure you have probably seen this information, but unless 2 children died, there are more than 7 children.
On the 1911 Census, there are 8 children listed:-
familysearch.org/ark:/61903/1:1:XWPW-1PS
On the 1901 Census, there was a daughter, Jane, listed, but as she doesn't appear in the later Census, I'm presuming that maybe she died.
familysearch.org/ark:/61903/1:1:X9ZW-52Q
I cannot find any fiurther information on the surname either. I have looked at a Polish site, and there are no people listed as resident in Poland with that surname. I tried alternative spellings based on pronunciation in case the surname was originally misspelled , but found nothing.
The only thing I am wondering is whether he was Jewish because 3 out of the 4 sons christian names are Jewish, Abram, Nathan and Isaac. If that is the case, you may find information through Jewish record sources.
Good luck with your search and sorry I couldn't be of more help.