My guess: because Orthodox Jews aren't naming their daughters
Olivia,
Madison, or
Harper.
If you look at the U.S. top 100 for 2017,
Elizabeth is the 2nd Biblical name listed (
Abigail #10,
Elizabeth #13). So it's common even among non-Jews, even if it may not "feel" that way. it's a classic that's still heavily in use.
Orthodox Jews being a subset of the general population, it's not surprising that the 2nd most popular current Biblical girl's name is also popular with them.
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(Speaking as a Jewish person! Also, I can only respond to one post at a time, but in your earlier post listing a bunch of boys' names, most of those are Old Testament names. Clicking on their link says so. The Torah is just the first 5 books, but the Jewish Bible is the entire Old Testament, where many of these names are from.
Also, I am not Orthodox, but of my Jewish friends and peers in the U.S. it's EXTREMELY common to have the English version of the name as our actual name, and the Hebrew version is only used for religious purposes, such as being called to the Torah by that name. Most Jewish people in the U.S. would be named
Jacob and then called
Yakov only in religious ceremonies. So Elizabeth/Elisheva being the same is not unusual.)