DS (21 months) doesn't say his name. He uses other children's, his sister's, mummy, daddy, etc. but not his own.
He obviously knows it and responds to it but if you say to him in a mirror 'Who's that?' he answers 'Mummy' even if I am holding him up and not in obvious sight.
Yesterday I said 'Say XXXXXX' and he said 'Mummy!'
Before he was 1 he went through a couple of weeks where he used a baby version of his name (which we don't use!) but it didn't last long.
Should add that we're not worried about him, just intrigued.