Definition of "Isabel"

Mariana. O my good lord! Sweet Isabel, take my part: Lend me your knees, and all my life to come, I'll lend you all my life to do you service.

c. 1603–1604 (date written), William Shakespeare, “Measure for Measure”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)

There is a silvery bell-like music in the name, which is exceedingly attractive, and which has made it a favorite with the poets. - - - Mary Howitt, in her Flower comparisons, has the following melodious lines:Now for mad-cap Isabel: / What shall suit her, pr'y thee tell? / Isabel is brown and wild; /Will be evermore a child;

1852 August, D. H. Jacques, “A Chapter on Names”, in The Knickerbocker, or, New-York Monthly Magazine, volume XL, page 119

I'm glad you spell your name like that. It's the best of all the ways to spell Isabel.

1994 Barbara Vine (Ruth Rendell), No Night Is Too Long, page 110

How many poor girls, who would have been wild and raging and beautiful and free sex goddesses if only their parents had found it in their hearts to name them Isabel, instead had to stuff their poor psyches into the name Heather?

2002, Cynthia Heimel, If You Can't Live Without Me, Why Aren't You Dead Yet?, Grove Press, page 177