moniker

He earned the moniker “Gator” from his days wrestling alligators in Florida.他因为年轻时在佛罗里达州跟鳄鱼摔过跤而赢得了“鳄鱼”的绰号。

I think “Happy” is an appropriate moniker for someone who smiles so much.我觉得对一个爱笑的人来说，Happy是个恰当的绰号。