Wikipedia
Kinnui
A kinnui or kinui (translated as "nickname") is the secular name held by Jewish people in relation to the language spoken by the country they reside in, differing from their Biblical Hebrew name.
The religious name is in Hebrew (for example, Moses ben Maimon; Joseph ben Gershon; Shlomeh Arieh ben David HaLevi; Gershom ben Judah; Devorah bat Avraham), and the secular name is in whatever language is in use in the geographic locality (for example, Isaiah Berlin; Solomon Lyon Barnard; Sigmund Freud; Golda Meir; Etta Cone ).