I did a Social Security Death Index search on the name, Daividh, and only turned up 19 records. So, presumably, all of the Switkes in the U.S. today are probably descended from the original Switke immigrant(s).
There were a lot of first names used by the early Switkes that have also been commonly used by immigrant Jews: Julius, Leon, Leonard, Morris, Salomon, Selma. So I wonder if the husband's family of our inquirer may be of Jewish descent?
We won't know, unless she comes back to give tell us.