Not necessarily. Davis indicates that an ancestor of that person was named David. It is the equivalent of Davidson or Davison. Since David was originally a Hebrew name, Davis COULD be Jewish. Or it could be Gentile.
I was always told that It was Welsh, Some say Irish since many Davies moved to Ireland.
Dickie Davies's birth name is Richard Davies.
Lew Davies's birth name is Lewis A. Davies.
Stevee Davies's birth name is Stevee Davies.
Deddie Davies's birth name is Gillian Davies.
Garnon Davies's birth name is Garnon John Davies.
Gron Davies's birth name is David Goronwy Davies.
Iva Davies's birth name is Ivor Arthur Davies.
Jeffrey Davies's birth name is Jeffrey Douglas Davies.
Lane Davies's birth name is Lane Hunt Davies.
Lindy Davies's birth name is Lindy Belle Davies.
Margot Davies's birth name is Margaret Rhys Davies.
Vivian Davies's birth name is W. Vivian Davies.