The Catholic Church called it the Sabbath of the Jews.
"The Church, on the other hand, after changing the day of rest from the Jewish Sabbath, or seventh day of the week, to the first, made the Third (fourth) Commandment refer to Sunday as the day to be kept holy as the Lord's Day." The Catholic Encyclopedia Topic: Ten Commandments, 2nd paragraph
What is a Jew? The letter "J" didn't exist until the 14th century.
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en.wikipedia.org
The letter J was infused into the letter Y, which is the letter Yod in Hebrew, as in YHWH.
Is it an, Atheist, resident of Judea? Is it an Atheist of the tribe of Judah? If so, is it ethnically passed from the father to the son as in scripture; or is it ethnically passed from mother to son, according to Pharisee tradition? Is it someone who practices Rabbinic Judaism? How about the Karaites?
Can being a Jew translate to being Yahudim, which translates to Yah's people?
(CLV) Ex 31:13
Now you, speak to the sons of Israel saying, Surely, My sabbaths shall you keep, for it is a sign between Me and you throughout your generations to know that I am Yahweh, Who is hallowing you.
As Christianity is a sect of Judaism; are not Christians Yahudim?