An expert in or student of etymology; = etymologist.
In later use sometimes specifically: a person who practises etymology in an unscientific or primitive way. Etymologist is now the usual term..
Origin
Early 17th century; earliest use found in Edmund Bolton (?1575/5–?1634), antiquary and historian. From classical Latin etymologus (Varro; probably from Byzantine Greek ἐτυμολόγος (first attested later than the Latin word; from Hellenistic Greek ἔτυμον + -λογος: see -loger)) + -er.