Diminutive of Michael, from Hebrew 'Mikha'el' meaning 'who is like God?'
Mikey is the warmest and most informal diminutive of Michael, which arrives from the Hebrew *Mi-ka-El* — a rhetorical question meaning "Who is like God?" The question is meant to be unanswerable, a declaration of divine uniqueness, and it made Michael one of the most theologically loaded names in Abrahamic tradition. The archangel Michael appears in the Hebrew Bible, the New Testament, and the Quran as a celestial warrior and protector, and by the Middle Ages the name was spreading across Europe in every linguistic variant imaginable: Michel, Miguel, Mikhail, Mihail, Michal.
In English, the informal chain runs Michael → Mike → Mikey, with each step moving closer to the playground and further from the archangel. Mikey is the form given by parents and families to small boys — it carries the specific warmth of childhood, the name a mother uses when she is pleased or a sibling uses when teasing. It rarely appears on birth certificates alone; it is almost always a lived name, earned through use.
This gives it an unusual emotional texture: where Michael is formal and where Mike is workmanlike, Mikey is purely affectionate. In popular culture, Mikey has its own distinct presences. The Life cereal commercials of the 1970s, in which the finicky young child Mikey unexpectedly eats what others won't, made the name synonymous with a particular kind of endearing stubbornness.
In *The Goonies* (1985), Mikey Walsh is the earnest, imaginative heart of the adventure — the dreamer who believes in treasure maps. Mikey Way of My Chemical Romance gave the name a rock-and-roll register. Registering Mikey formally as a given name rather than a nickname is a contemporary choice that leans deliberately into that softness, refusing the serious diminutive in favor of the loving one.