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Wiktionary
yekke

alt. (context mildly derogatory English) A Jew originating from Germany currently living in Israel. n. (context mildly derogatory English) A Jew originating from Germany currently living in Israel.

Wikipedia
Yekke

A yekke is a Jew of German-speaking origin. The term carries the connotation that German Jews are notable for attention to detail and punctuality.