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Home › Baby Names Directory › Theory

Theory

♀ Girl

Pronounced THEE-uh-ree /ˈθi.ə.ri/Medium

Meaning: From the English word theory, 'a theory; a supposition; a contemplation' (from Greek theoria, 'a viewing; contemplation') — a word-name; used for both sexes; here for girls; we note the word-nameLow

In 30 seconds: A theory; a contemplation: Theory is an English word-name. Crisp, modern, and warm. Used for both sexes (here for girls).
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Origin LowEnglish, Greek
MeaningFrom the English word theory, 'a theory; a supposition; a contemplation' (from Greek theoria, 'a viewing; contemplation') — a word-name; used for both sexes; here for girls; we note the word-name
U.S. rank (2024)#7889 ↘ Falling
2024 U.S. births14 girls (0.00% of U.S. girls)
Peak year2023
Total births (all-time)≈ 142

Popularity in the U.S. · SSA data

peak 202320062024

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Theory comes from the English word theory, 'a theory; a supposition; a contemplation' (from Greek theoria, 'a viewing; contemplation'; a word-name; we note the word-name). Used for both sexes, here for a girl (slug distinguished; said 'THEE-uh-ree').

In the U.S. it registers thinly. Rare, a-contemplation at the root, and modern.

Did you know? Theory comes from Greek theoria, 'a viewing; contemplation' — a crisp, modern word-name, used for both sexes (here for girls; we note the word-name; said 'THEE-uh-ree').
Overall data confidence 32%
References — Theory — word-name; unisex

Variations

TheorieTheorey

Nicknames

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Famous Bearers

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If you like Theory…

Trinity— a fellow abstract word-name girls' name
Legacy— a companion abstract word-name
Story— a sound-neighbor modern word-name
Reverie— another contemplative word-name

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Frequently Asked

What does the name Theory mean?

Theory is an English word-name — 'a theory; a contemplation' (Greek 'a viewing'); used for both sexes; here for a girl. We note the word-name.

How do you pronounce Theory?

It's said THEE-uh-ree /ˈθi.ə.ri/ — three syllables, stress on the first.

Is Theory a boy or girl name?

Theory is used for both sexes; this page covers its use as a girl's name.

How popular is Theory?

Theory is a very rare name in the U.S.

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