Hi Laura As update, did find my grandfather Riskalla by using the Ellis Island in One Step site, which has more powerful and flexible search engine. His name is Shagawat, and it was variously spelled as Chegova, Chaghoonat, and Shaghoowat depending on which year he entered and came back and returned between 1904 and 1913.
On the One Step Ellis Island site, you can search just by nationality or orher parameters with as little as first one or two letters of surname.Go to Yahoo, type in Ellis Island One Step, and this will show you link for this search engine. There is also free download software to search Ellis Island database with automatic generation of name permutations you can also find by searching Ellis Island related sites via Yahoo. Again, good luck