French form of Thais, from Greek meaning 'the one who is beloved'; the name of an Alexandrian courtesan who became a Christian saint, and the subject of Massenet's opera.
Vibe
playful
How it ages.
Operatic and classical; ages with artistic gravitas in Francophone and Lusophone contexts.
The cultural moment.
Used in France and Brazil; Brazilian usage grew in the 1980s-90s.