The American redstart (Setophaga ruticilla) is a New World warbler. It is only distantly related to the Old World (common) redstart, with both belonging to the order Passeriformes.
Taxonomy
The American redstart was described by Carl Linnaeus in 1758 in the 10th edition of his Systema Naturae under the binomial name Motacilla ruticilla.
The genus name Setophaga is from Ancient Greek σής : sēs (genitive σητός : sētós) "moth", and φάγος : phágos "eater".
The specific ruticilla is Neo-Latin for "redstart" from Latin rutilus, "red", and the diminutive -cilla.
In Ancient Greek the name was φοινίκουρος : phoiníkouros (from φοῖνιξ : phoĩnix- "red" and οὐρά : ourá "tail") "Redstart" refers to the male's red tail, "start" being an old word for tail.