Some are born with unusual names.
But others have chosen unique monikers for themselves.
The name Chicken might sound demeaning or disrespectful, but one operations director at a roofing company has gladly taken it on.
Says Mr Chicken Ong, 45: "That's how people have come to know me. Why shouldn't I embrace it?"
He got the nickname about 20 years ago, after winning a chicken-eating competition at the office.
He recalls: "It was an office celebration, and someone brought in a lot of Kentucky Fried Chicken.
"I ate five pieces at one go. After that, my colleagues started calling me Chicken, and it stuck."
His family and friends soon caught on, and the name is now found on his business card.
He says: "At one point, some friends tried to stop calling me by that name.
"They thought it was demeaning to me, like they were calling a pet or a prostitute."
Misunderstandings have also occurred when his friends' wives saw his name saved in their husbands' phones.