Boy Name
Tadashi
Tadashi 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.
Tadashi — a boy name — is an uncommon, standout choice. If Theodis is on your shortlist, Tadashi belongs in the same conversation.
Tadashi meaning, origin, and usage
Meaning: Tadashi has a distinctive sound and evolving modern usage.
Origin: Multiple naming traditions are associated with this name.
Pronunciation: Baby Name Studio pronounces Tadashi as T·A·D·A·S·H·I, with 7 letters and a boy usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Tadashi is an uncommon, standout choice in the Rare tier.
Tadashi variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Tadashia, Tadashie, Tadashiy, Tadash.
- Nicknames: Tada and T.
- Middle names: Pair Tadashi with a middle name that balances its substantial sound; start with the Tadashi middle name generator.
- Sibling names: Theodis, Theotis, Thadeus, Thaddaeus, Takashi — full picks on the sibling names for Tadashi guide for a cohesive sibset.
- Similar names: Looking for names that sound like Tadashi? Browse our names like Tadashi 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 Tadashi
What does the name Tadashi mean?
Tadashi 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 Tadashi?
The exact origin of Tadashi is debated, but it has been used across multiple naming traditions.
How do you pronounce Tadashi?
Tadashi has 7 letters and is most commonly stressed on the first syllable.
Is Tadashi a boy's or girl's name?
Tadashi is primarily used as a boy's name in US records.
How popular is Tadashi in 2026?
In our 2026 popularity tracker, Tadashi sits in the Rare tier — an uncommon, standout choice.
What names are similar to Tadashi?
Names that share Tadashi's sound and style include Theodis, Theotis, Thadeus, Thaddaeus, Takashi.
What middle names pair well with Tadashi?
Good middle-name fits for Tadashi pair an opposite syllable rhythm: if Tadashi is short, lean longer (e.g. classical or three-syllable middles); if Tadashi is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Tadashi?
Sibling names that pair naturally with Tadashi share its rhythm without rhyming — Theodis, Theotis, Thadeus all sit comfortably alongside it on a shortlist.