Diminutive of Isabel or Isadora, ultimately from Hebrew Elizabeth meaning 'God is my oath.'
Izzie is a bright, informal diminutive most commonly derived from Isabel or Isabella — names that trace back through Spanish and Provençal forms to the Hebrew Elisheba (אֱלִישֶׁבַע), meaning "my God is an oath" or "my God is abundance." Isabel was the Spanish form of Elizabeth, and it spread across Europe through royal marriages in the medieval and Renaissance periods — queens of Castile, Portugal, and France bore the name, each adding luster to its legacy. The nickname Izzie, with its double-z energy, captures all of Isabel's regal history in a form that feels entirely approachable.
Izzie can also spring from Isadora ("gift of Isis"), Isolde (the tragic Celtic heroine of Arthurian legend), or even as a standalone given name in its own right. The character Isobel "Izzie" Stevens on the television drama "Grey's Anatomy" (2005–2010), played by Katherine Heigl, introduced the nickname to a new generation of viewers and contributed to its visibility as a standalone name rather than just a nickname. Literary and screen culture have long favored the Iz- family of names for heroines who are warm, determined, and emotionally vivid.
As a given name today, Izzie radiates playful confidence. It has the doubled consonant energy of Billie, Millie, and Josie — names that feel both retro and utterly contemporary. It is a name for a person who will never be hard to find in a crowd, yet somehow always feels like herself. Whether standing alone or shortening an Isabella, Izzie carries centuries of meaning lightly, like a laugh.