Although not a medical root term, the root [-nym-] arises from the Greek [onoma] meaning "name". There are many terms that incorporate this root:

Eponym: Use of a proper name to denote a structure
Eunym: [Eu-] is a prefix that means "good", so it imeans a "good name". Also written as "euonym"
Homonym: Same name
Synomym: "A name with the same sense, or same meaning"
Antomym: From the Greek [ant- and anti] meaning opposite. An opposite name
Anonym: From the Greek [an- and ano-] meaning "without". Without a name (anonymous)
Pseudonym: From the Greek [Pseudo-] meaning "false". A false name
Toponym: From [topos], meaning place. The name of a place or location