Probably a diminutive or variant related to Toni, itself from Antonia meaning priceless.
Tondi is probably a diminutive or variant related to Toni, which itself comes from Antonia and ultimately means priceless. That heritage gives the name a classic foundation, even though the form itself is brief and uncommon.
The diminutive quality makes it feel affectionate and lightly playful. As a given name, Tondi has a compact, friendly sound. It is easy to say and easy to remember, but unusual enough to stand apart.
The connection to Antonia keeps it grounded in a long naming tradition, while the modern shape makes it feel fresh. Tondi is simple, warm, and quietly distinctive.