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Home › Baby Names Directory › Costello

Costello

♂ Boy

Pronounced koh-STEL-oh /koʊˈstɛl.oʊ/Medium

Meaning: From the surname Costello — in Ireland an anglicizing of Mac Oisdealbhaigh, and in Italy a name linked to 'little castle' (castello). Carried into first-name use; well known via comedian Lou Costello. Noted honestly.Low

In 30 seconds: A surname name with flair: Costello is Italian and Irish (said 'koh-STEL-oh'). Warm and characterful.
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Origin MediumItalian, Irish
MeaningFrom the surname Costello — in Ireland an anglicizing of Mac Oisdealbhaigh, and in Italy a name linked to 'little castle' (castello). Carried into first-name use; well known via comedian Lou Costello. Noted honestly.
U.S. rank (2021)#12507 ↗ Rising
2021 U.S. births5 boys (0.00% of U.S. boys)
Peak year1951
Total births (all-time)≈ 61

Popularity in the U.S. · SSA data

peak 195119422021

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

Costello is an Italian and Irish surname (Irish Mac Oisdealbhaigh; Italian 'little castle'), used here as a given name and familiar via Lou Costello. It reads characterful and warm — rare in the U.S. (said 'koh-STEL-oh').

In the U.S. it appears only rarely as a first name. Rare, surname-style, and warm.

Did you know? Costello is a surname — in Ireland from Mac Oisdealbhaigh, in Italy linked to castello ('little castle') — carried into first-name use, and well known via comedian Lou Costello; warm and characterful, noted honestly (said 'koh-STEL-oh').
Overall data confidence 44%
References — Costello — Italian/Irish surname; 'little castle' / Mac Oisdealbhaigh

Variations

CostellaKostelloCostelo

Nicknames

CosStel

Famous Bearers

  • Famous bearers coming soon.

If you like Costello…

Costa— a like Italian Cos- surname
Marcello— a like Italian -ello name
Angelo— a like warm Italian pick
Cosimo— a like Italian Cos- name

Explore names like Costello

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Frequently Asked

What does the name Costello mean?

Costello is a surname — Irish (from Mac Oisdealbhaigh) and Italian (linked to 'little castle') — used here as a first name.

How do you pronounce Costello?

It's said koh-STEL-oh /koʊˈstɛl.oʊ/ — three syllables, stress on the second.

Is Costello a boy or girl name?

Costello is used here as a boy's name.

How popular is Costello?

Costello is rare in the U.S.

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