Anyone else have any experience with something similar?

Anyone else have any experience with something similar?

My sons name is Henry, he knows his name is Henry. If i ask or his dad asks or family members ask, he will tell us his name is Henry.

But now, and this happens nearly every time we go out, someone asks his name and he tells them that his name is Parker.

He doesnt know a parker, doesn't watch any shows with a parker in them (he only watches a few certain shows and im always in the room) and he doesnt spend time with a babysitter or other caregiver that would introduce him to that name. I have NO IDEA where he heard the name from at all. But he says it with absolute confidence like thats been his name all his like. He will hold his hand out to shake yours and go "Hi! My name is Parker!", serious as can be. Weve asked him who parker is and he says that hes parker. But if i ask his name he says its Henry. I want to write it off as silly 3 yead old nonsense. But he does this every time someone outside of the family asks him his name. Its never a different name, its never Henry. Its always Parker. Were honestly mildly concerned that hes so adamant with stangers that his name is Parker. He will tell them Henry is not his name when we tell people it is, and insist its Parker. Anyone elses kid do this?