sarai

As proper nouns the difference between jenny and sarai

is that jenny is a diminutive of the female given names jane and jennifer, also used as a formal given name while sarai is (biblical character) wife of the semitic patriarch abram (abraham), mother of isaac her name was changed to sarah.

As a noun jenny

is (uk|informal) a wren (a member of the wrns).

As a proper noun sarai

is (biblical character) wife of the semitic patriarch abram (abraham), mother of isaac her name was changed to sarah.

As an adjective undefined is

lacking a definition or value.

As proper nouns the difference between ellen and sarai

is that ellen is while sarai is (biblical character) wife of the semitic patriarch abram (abraham), mother of isaac her name was changed to sarah.