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Glennon
How to Pronounce Glennon
Pronounced GLEN-uhn /ˈɡlɛn.ən/High
Meaning: Glennon is an Irish surname (anglicized from Ó Gliannáin / Ó Gleannáin) taken up as a given name, and popularly linked to the word glen, 'valley'. As a first name it passed on a family surname, in the pattern of surname-as-given-name; the 'valley' association reinforced its appeal.Low
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
Glennon is an Irish surname, anglicized from Ó Gliannáin (or Ó Gleannáin), taken up as a given name in the American pattern of honoring a family surname. Its sound also links it to glen, 'valley', which gave it an appealing, nature-tinged echo; both the family-name and the valley association shaped its use.
As a first name it was always rare — a few dozen boys a year at its faint peak in the late nineteen-fifties — and it stayed a scattered, often Irish-Catholic family choice. It reads as a vintage Irish surname name; distinctive and clan-flavored, it has stayed uncommon rather than joined the broad surname-revival trend.
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Frequently Asked
What does the name Glennon mean?
Glennon is an Irish surname (from Ó Gliannáin) used as a given name, popularly linked to glen, 'valley'.
How do you pronounce Glennon?
It's said GLEN-uhn /ˈɡlɛn.ən/ — two syllables, stress on the first.
Is Glennon a boy or girl name?
Glennon is used as a boy's name.
How popular is Glennon?
Glennon has always been rare in the U.S., a vintage Irish surname name most seen in the mid-twentieth century.