Slavs
Standardised Slavic languages that have official status in at least one country are: Belarusian, Bosnian, Bulgarian, Croatian, Czech, Macedonian, Montenegrin, Polish, Russian, Serbian, Slovak, Slovene, and Ukrainian.
Croatia
The origin of the name is uncertain, but is thought to be a Gothic or Indo-Aryan term assigned to a Slavic tribe. The oldest preserved record of the Croatian ethnonym "*xъrvatъ" is of variable stem, attested in the Baška tablet in style "zvъnъmirъ kralъ xrъvatъskъ" ("Zvonimir, Croatian king").