Peters can be a Jewish name (if it is a name used by a Jewish family) but it need not be Jewish. The name is used by Jews and by non-Jews. Think of all those Scandinavians.
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There is no surname that is used only by Jews. There are many surnames that are used both by Jews and non-Jews. Therefore, any surname that is used by a Jewish family is Jewish, and any surname that is used by a non-Jewish family is not Jewish. So any surname can be both Jewish and non-Jewish at the same time.
Himmler is not a Jewish Surname according the Jewish Surname list of 37,000 names.
Although Howell is not a stereotypically Jewish surname, any name can be a Jewish name if it is the name of a Jewish person.
Although Salada is not a Jewish surname in its origin, any name can be a Jewish name if it is the name of a Jewish person.
When used as a Jewish person's surname, yes. When it isn't, it isn't.