Where is the last name "sinal" come from?

Question

and also "mosseri"?

Answer 1

These names sound Semitic / Arabic or Turkic...

Check houseofnames.com

Answer 2

There are only a few Sinals listed in the census, and they are from Austria, Poland and Russia.

Mosseri also only has a few names, and Italy is the country of origin.

Answer 3

Sinal was probably originally Szynal and would have been from Galicia, which was the Austrian partition of Poland. I've done some work on the Szynal line for a family in Chicago and the records from Galician immigrants are pretty easily obtained. Mosseri is a pretty common Sephardic name. It's found throughout North Africa and the Middle East. There are also branches of it that went up into the northern parts of the old Ottoman Empire, especially around Albania and Serbia. If you find the names of the immigrant ancestors in your family with these names, you can find more on them at http://www.ellisisland.org and http://www.archives.gov