No one knows exactly where Juan de la Cosa was born, but the most accepted hypothesis is that it was in Santoña (Cantabria), because there are documents showing that he was a resident there and his wife and daughter lived in that city.
Non se sabe con certeza onde naceu Juan de la Cosa pero a hipótese máis aceptada é que foi en Santoña (Cantabria), xa que se conservan documentos que mostran que foi veciño de Santoña e que a súa muller e filla residiron nesa cidade.