a nine-day wonder

a nine/one/seven-day wonder

someone or something that causes interest or excitement for a short period but is then quickly forgotten His music was derided by an older generation convinced that he was a nine-day wonder.

Common Names:

Name	Pronounced	Usage
Ioann	-	Russian
Mal'akhi	-	Biblical Hebrew
Melanie	MEL-ə-nee (English), ME-lah-nee (German)	English, German, Dutch
Joan (2)	joo-AHN (Catalan), zhoo-AHN (Catalan)	Catalan, Occitan
Isingoma	-	Eastern African, Ganda
ŽArko	-	Serbian, Croatian