In Latin this tree is called delonix regia and royal poinciana; flame tree or flamboyant in English.
It has many names in Thai:
นกยูงฝรั่ง / nok yung farang [peacock]
หางนกยูงฝรั่ง / hang nok yung farang [tail-peacock-foreign]
อินทรี / in si [eagle]
หงอนยูง / ngon yung [crest-peacock]
ส้มพอหลวง / som pho luang [orange-father-royal]
If I could choose, I’d like to become this tree.