What is an example of irony in the book Call it Courage?

One example of irony in Call it Courage is Mafatu's name. He is given the name Mafatu because it means "Stout Heart". This is a significant name in a culture where bravery is lauded above all other traits. The name is ironic because Mafatu is terrified of the sea in a world where the ocean and what it provides is the most integral part of life.