Joó is a Hungarian surname that represents a variant of Jó. The root surname Jó is a byname derived from the Hungarian word jó, meaning "good". As a common vocabulary word, jó has been frequently used as a personal name or nickname in Hungarian tradition, and from such usage, the surname Joó emerged through patronymic or variant formation bearing the added -ó suffix. This transformation parallels other Hungarian surname patterns where a base adjective or attribute takes a vowel-ending variant.
In Hungarian onomastics, surnames like Joó can trace their origins to the Middle Ages, when descriptive nicknames based on personal qualities such as "goodness" were adopted as family names. The name is thus a direct reflection of a positive characteristic, likely originally given to someone of good moral character, kindness, or fitness. While no globally notable bearers are recorded in the brief’s web sources, the surname remains present in Hungary though it is relatively uncommon.
- Meaning: "good" (from Hungarian jó)
- Origin: Hungarian
- Type: Surname, variant of Jó
- Usage regions: Hungary