Definitions of marlin:

• noun:   large long-jawed oceanic sport fishes; related to sailfishes and spearfishes; not completely cold-blooded i.e. able to warm their brains and eyes
• name:  A male given name (rare: 1 in 8333 males; popularity rank in the U.S.: #609)
• name:  A female given name (rare: 1 in 100000 females; popularity rank in the U.S.: #3788)
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #5577)