The name is borne by Don Juan, a character from Spanish legend who, after killing his lover's father, is dragged to hell by the father's ghost. The story was adapted into plays by Tirso de Molina (1630) and Molière (1665), an opera by Mozart (1787), and an epic poem by Byron (1824), among other works.
Famous bearers include the Renaissance painter Antonio Pisanello (c. 1395-1455) and the Baroque composer Antonio Vivaldi (1678-1741). It is also the name of the main character in The Merchant of Venice (1596) by William Shakespeare.
A known bearer of this name is the Brazilian musician and composer Altamiro Carrilho (1924-2012). In literature, Altamiro is the name of the protagonist of the Spanish comic strip series Altamiro de la Cueva, which was first published in 1965.