Dzongkha (རྫོང་ཁ་; Wylie: rdzong-kha, Jong-kă), occasionally Ngalopkha, is the national language of Bhutan. The word "dzongkha" means the language (kha) spoken in the dzong, – dzong being the fortress-like monasteries established throughout Bhutan by Shabdrung Ngawang Namgyal in the 17th century.
"Bhutani" is not another name for Dzongkha, but the name of a Balochi language. The two are sometimes confused, even in some published ISO 639 codelists.
Read more about Dzongkha: Classification and Related Languages, Usage, Writing