Namesakes
Portuguese Presidents and Prime Ministers:
2 prime ministers, 1 president, 1 prime minister/president
(prime minister) António Bernardo da Costa Cabral 1849-1851 
(prime minister/president) Manuel Gomes da Costa 1926
(president) Francisco da Costa Gomes 1974-1976
(prime minister) Alfredo Nobre da Costa 1978
Saints:
1 blessed
Blessed Alexandrina Maria da Costa 1904-1955