JewishGen Discussion Group #JewishGen Isabel, Elizabeth, and Jezebel #general
The online etymology dictionary at
states in its entry on "jezebel" (the common noun) that the name
Jezebel is "said to be" the source for both Isabel and Elizabeth.
This is a remarkably detailed resource, and while its accuracy
can be debated, the seriousness of its compiler is evident.
As in many cases of name origins, the truth may be impossible to
come by; in fact, it's entirely possible for one name to have more
than one true origin. See etymonline's entry for "Joel" for an
Providence RI USA