The following are names we used for our chickens, and why:
Skeeter - when he was young, he and his siblings learned certain sounds to come to me, or move away from me. Moving away sounded like "sskksst!" Usually I made the sound when they were on something I wanted to flip over to search for bugs. Skeeter was very friendly and was almost ALWAYS the one in the way, so one day I just called him Skeeter, based on the sound I always made for him to move.
Brownie - She was the only un-named one for a while, and she's brown. So she picked up the name "Brownie" as a result.
Bobo - He acted like a clown. He loved to flap his wings at everyone, and drag his wing, although never really attacked. So we called him Bobo the clown.
Cookie and Cream - This was the name of two hens. The ameraucana looked like Cookies and Cream ice cream. She was named Cookie, and a solid white plymouth rock was named Cream as a result.
Harry - Our first bantam rooster, and the first chicken we owned with feathers on his legs. The nieces and nephews kept referring to him as the "hairy-legged chicken" so we called him "Harry".
Henny - Another one we couldn't think of a name for, so I called her by henny one day to come eat some treats, and it stuck.
Karmel - She turned out to be a caramel-BROWN-laced hen, and reminded one of my nieces of caramel ice cream topping.
Buddy - Okay, buddy is actually a hen, NOT a rooster. None of us can sex chicks, and Buddy was hatched here at our home in an incubator. She is a phoenix rock crossed with ameraucana, and we had trouble guessing if she was a hen and rooster because of the comb differences. She was very outgoing though, and stood up a lot. She is also the ONLY chicken that will come RUNNING at full speed when called, sit on your shoulder, eat directly from your hand, peck at your hair gently, and coo at you. So I called her my little buddy before realizing she was actually a hen. Yet when we found out, she already knew the name "Buddy" and we kept it at that.