Bangladesh: noun: Bangladeshi(s)
adjective: Bangladeshi
Barbados: noun: Barbadian(s) or Bajan (colloquial)
adjective: Barbadian or Bajan (colloquial)
Belarus: noun: Belarusian(s)
adjective: Belarusian
Belgium: noun: Belgian(s)
adjective: Belgian
Belize: noun: Belizean(s)
adjective: Belizean