About Croatian: Croatian language is a Slavic language. Croatian is the official language of the Republic of Croatia. Around 5,540,590 people speaks Croatian language in Croatia. It belongs to the South-Slavonic languages. It is also one of the official languages of Serbia, Bosnia and Herzegovina, Montenegro. The speakers of the language are found in Italy, Romania also. The Croatian language derived into 2 branches - 1. East South Slavic, 2. West South Slavic.