Sly

♂ Boy

Pronounced SLY /ˈslaɪ/High

Meaning: The English word sly, meaning 'cunning, crafty' — a plain fact families should weigh. It is also a well-known short form of Sylvester, carried by musician Sly Stone and by the actor Sylvester 'Sly' Stallone.Medium

In 30 seconds: Short and sharp: Sly is the English word for 'cunning', and a short form of Sylvester (said 'SLY').

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Origin MediumEnglish

MeaningThe English word sly, meaning 'cunning, crafty' — a plain fact families should weigh. It is also a well-known short form of Sylvester, carried by musician Sly Stone and by the actor Sylvester 'Sly' Stallone.

U.S. rank (2022)#12107 ↘ Falling

2022 U.S. births6 boys (0.00% of U.S. boys)

Peak year1994

Total births (all-time)≈ 91

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

Sly as a first name comes chiefly from Sylvester, shortened. The word itself means 'crafty' or 'cunning', which is worth naming outright rather than smoothing over. Its cultural warmth comes largely from Sly Stone and Sly Stallone (said 'SLY').

It is very rare as a given name in the U.S. Rare, punchy, and one syllable.

Did you know? Sly does double duty — it is the everyday English word for 'cunning', and a nickname for Sylvester, worn by musician Sly Stone and actor Sylvester Stallone. We state both plainly so families choose with open eyes (said 'SLY').

Overall data confidence 60%

References — Sly — English word 'cunning'; short form of Sylvester; Sly Stone, Sylvester Stallone

Variations

SlighSy

Nicknames

SlickSy

Famous Bearers

Famous bearers coming soon.

If you like Sly…

Sylvester— the full name Sly shortens

Ace— a like punchy one-syllable pick

Jax— another short, bold modern name

Cash— a similar word-name with edge

Explore names like Sly

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By meaningRock / Stone

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Frequently Asked

What does the name Sly mean?

Sly is the English word for 'cunning'. It is also a short form of Sylvester.

How do you pronounce Sly?

It's said SLY /ˈslaɪ/ — one syllable, rhyming with 'fly'.

Is Sly a boy or girl name?

Sly is used as a boy's name.

How popular is Sly?

Sly is a very rare given name for boys in the U.S.