... an exotic plant from West Indies and tropical America, cultivated pan-tropically, commonly known as Barbados flower-fence, dwarf poinciana, paradise flower, pride of Barbados, red bird of paradise.
As Tabish pointed out - it is popularly known as peacock flower in India, and it is known in almost all regions of India :-- Assamese: krishnachura • Bengali: krishnachura • Hindi: कृष्ण चरण krishna-charan, कृष्ण चूरा krishna-chura • Kannada: ಚಣ್ಣಕೇಶವ ಗಿಡ channakeshava gida, ರತ್ನಗಮ್ಧಿ ratnagamdhi • Konkani: रत्नगंधी ratnagandhi • Manipuri: krishanchura • Marathi: मोरशेंडा morshenda, राजतुरा rajtura, संकासुर sankasur, शंकासूर shankasur, शंखासुर shankhasur • Mizo: krishanchura • Oriya: tarra • Sanskrit: कृष्णचूडा krishnachuda, रत्नगन्धि ratnagandhi • Tamil: மயிற்கொன்றை mayir-konrai • Urdu: gul-e-turra
I will not be surprised if this plant was introduced to India ages ago (exagerrating) !!
Regards.