Sentence:  ‘I didn′t know your son′s name was <WSD>Rocky</WSD>,' I quietly said as we started walking again. / ‘It's really Richard. When he was a kid we called him Ricky, which somehow turned into <WSD>Rocky</WSD>. Some people call him Rocco. He gets called a lot of things.' 
Meaning of the word marked with <WSD> tags:  A male given name, pet form of Rocco and Roch.