The Javan flowerpecker was formally described and illustrated in 1829 by the Dutch zoologist Coenraad Jacob Temminck based on a specimen that had been collected on the Indonesian island of Java by Heinrich Kuhl and Johan Conrad van Hasselt. Temminck coined the binomial nameDicaeum sanguinolentum.[2][3] The specific epithet is from Latinsanguinolentus meaning "bloody".[4] The Flores, Sumba, and Timor flowerpeckers were formerly considered as subspecies but are now treated as separate species based on the differences in plumage and vocalizations. The English name was changed from "blood-breasted flowerpecker" to "Javan flowerpecker" to reflect the reduced range.[5]