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Theory
How to Pronounce Theory
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
Popularity in the U.S. · SSA data
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.
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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.