Noun byrd has 2 senses

• byrd(n = noun.person) william byrd - English organist and composer of church music; master of 16th century polyphony; was granted a monopoly in music printing with Thomas Tallis (1543-1623);
is a kind of composer, organist

• byrd(n = noun.person) admiral byrd, richard e. byrd, richard evelyn byrd - explorer and United States naval officer; led expeditions to explore Antarctica (1888-1957);
is a kind of adventurer, explorer, naval officer