Boy Name
Isidor
Isidor is a boy's name whose meaning is not firmly attested in the historical record. It is used as a boy's name across several naming traditions, and it is rare in the United States today — outside the SSA top 1,000.
Isidor is a boy baby name. It currently sits in the Rare tier of US baby names for 2026, and parents who love Isidor often also consider Isidoro.
Isidor meaning, origin, and usage
Meaning: Isidor has a distinctive sound and evolving modern usage.
Origin: Multiple naming traditions are associated with this name.
Pronunciation: Baby Name Studio pronounces Isidor as I·S·I·D·O·R, with 6 letters and a boy usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Isidor is an uncommon, standout choice in the Rare tier.
Isidor variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Isidora, Isidore, Isidory, Isido.
- Nicknames: Isi and I.
- Middle names: Pair Isidor with a middle name that balances its substantial sound; start with the Isidor middle name generator.
- Sibling names: Isidoro, Isidro, Isadora, Isidore, Isreal — full picks on the sibling names for Isidor guide for a cohesive sibset.
- Similar names: Looking for names that sound like Isidor? Browse our names like Isidor guide for phonetic-neighbor picks.
- Explore more: use the Baby Name Explorer, name search, AI name generator, and Baby Name Studio homepage.
Frequently asked about Isidor
What does the name Isidor mean?
Isidor has no single meaning that is firmly attested in the historical record. It is used as a boy name in US birth records, and parents usually choose it for its sound rather than a documented meaning.
What is the origin of Isidor?
The exact origin of Isidor is debated, but it has been used across multiple naming traditions.
How do you pronounce Isidor?
Isidor has 6 letters and is most commonly stressed on the first syllable.
Is Isidor a boy's or girl's name?
Isidor is primarily used as a boy's name in US records.
How popular is Isidor in 2026?
In our 2026 popularity tracker, Isidor sits in the Rare tier — an uncommon, standout choice.
What names are similar to Isidor?
Names that share Isidor's sound and style include Isidoro, Isidro, Isadora, Isidore, Isreal.
What middle names pair well with Isidor?
Good middle-name fits for Isidor pair an opposite syllable rhythm: if Isidor is short, lean longer (e.g. classical or three-syllable middles); if Isidor is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Isidor?
Sibling names that pair naturally with Isidor share its rhythm without rhyming — Isidoro, Isidro, Isadora all sit comfortably alongside it on a shortlist.