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Leonidus

♂ Boy

Pronounced lee-ON-ih-dus /liːˈɒn.ɪ.dəs/Medium

Meaning: Leonidus is a variant spelling of Leonidas, from Greek leon ('lion'), meaning 'lion-like' or 'son of the lion.' It honors Leonidas I, the Spartan king who fell at Thermopylae. A documented classical name; we note the Greek route.Medium

In 30 seconds: A heroic classical name: Leonidus is a form of Leonidas, 'lion' (said 'lee-ON-ih-dus'). It honors the Spartan king, which we note.

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Origin MediumGreek

MeaningLeonidus is a variant spelling of Leonidas, from Greek leon ('lion'), meaning 'lion-like' or 'son of the lion.' It honors Leonidas I, the Spartan king who fell at Thermopylae. A documented classical name; we note the Greek route.

U.S. rank (2024)#11747 ↘ Falling

2024 U.S. births6 boys (0.00% of U.S. boys)

Peak year2008

Total births (all-time)≈ 157

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

As a boy's name, Leonidus is a variant of Leonidas, from Greek leon ('lion'), famed for King Leonidas I of Sparta. A documented classical name with a mighty ring; we note the Greek route (said 'lee-ON-ih-dus').

In the U.S. it appears rarely, its fame tied to the ancient king. Rare, heroic, and classical.

Did you know? Leonidus echoes Leonidas — the Spartan king of the 300 at Thermopylae — from Greek leon, 'lion.' A bold, heroic classical name, which we note (said 'lee-ON-ih-dus').

Overall data confidence 55%

References — Leonidus — Variant of Leonidas, Greek leon 'lion'; the Spartan king

Variations

LeonidasLeonidesLeonidos

Nicknames

LeoLeon

Famous Bearers

Famous bearers coming soon.

If you like Leonidus…

Leonidas— the standard form of the same name

Leon— a like lion-rooted boy's name

Leo— a like short lion pick

Cassius— a like heroic classical choice

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Frequently Asked

What does the name Leonidus mean?

Leonidus is a form of Leonidas, from Greek leon ('lion'); it honors the Spartan king Leonidas, which we note.

How do you pronounce Leonidus?

It's said lee-ON-ih-dus /liːˈɒn.ɪ.dəs/ — four syllables, stress on the second.

Is Leonidus a boy or girl name?

Here Leonidus is used as a boy's name.

How popular is Leonidus?

Leonidus is a rare spelling in the U.S., against the more familiar Leonidas.