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The short answer
Millie is a feminine English name that Behind the Name describes as a "diminutive of Mildred, Millicent and other names containing the same sound". Neither Mildred nor Millicent is available in the cached source set, so their underlying meanings are not verified in this pass. It is pronounced MIL-ee. In the United States it ranked #73 for girls in 2025.
Meaning and etymology
Behind the Name gives Millie as a "diminutive of Mildred, Millicent and other names containing the same sound". Neither the Mildred nor the Millicent entry is present in the cached source set, so this profile does not carry forward a gloss for either root name; the entry also lists Emil as a masculine form.
Editorial confidence: uncertain
Popularity
Millie ranked #73 for girls in the United States in 2025, according to Social Security Administration data.
| Region | Year | Rank | Source |
|---|---|---|---|
| United States | 2025 | #73 | ssa-2025 |
Nicknames, variants, and related names
Nicknames: None documented.
Variants: Milly
Related names: Mildred, Millicent
What the name feels like
Millie has the friendly, vintage-charm sound of a classic English nickname, now increasingly given as a formal name in its own right rather than only as a short form of Mildred or Millicent.
Style tags: vintage revival, nickname name, two syllables
Editorial interpretation: This style read is editorial judgment, not linguistic fact.
If you like this name
Names with a similar vintage nickname-name feel or two-syllable sound to Millie.
Similar by style
Similar by sound
Frequently asked questions
What does the name Millie mean?
Behind the Name describes Millie as a diminutive of Mildred, Millicent and other similar-sounding names; the underlying meanings of Mildred and Millicent are not verified against a cached source in this pass.
Is Millie short for Mildred or Millicent?
It can be either. Behind the Name lists Millie as a diminutive shared by Mildred, Millicent and other names containing the same sound, and it is also used as an independent given name today.
Is Millie a popular name?
Yes. Millie ranked #73 among girls' names in the United States in 2025, according to Social Security Administration data.
Sources
- Behind the Name: Meaning, origin and history of the name Millie — supports diminutive relationship, pronunciation, variants.
- U.S. Social Security Administration: Popular Baby Names — national data, year of birth 2025 — supports popularity.
