How did Bulgaria get the name Bulgaria?

Bulgaria gets its name from the Bulgar people, who migrated from Central Asia to Eastern Europe in the 7th century. They established Old Great Bulgaria (roughly where Ukraine is today) and later, some of them settled on the Balkans and mixed with the local Slavic and Thracian populations. They fought with and gained independence from the Byzantine Empire, to form the First Bulgarian Kingdom in 681 (the official "birth" of what is today Bulgaria).