If we have the wallet address of someone, can we know who is the owner the address?
Strictly speaking no.
But if we try to elaborate on this, considering majority of the users of bitcoin to be a part of this forum, doing a search engine lookup on that wallet address might reveal a linked forum account in case the address was staked here.
Beyond this, I dont see how we can search out the real owner of the address, its not like people wear it around their neck or go around announcing everyone about their receiving address. Obviously everyone is paranoid of their holding so they would rather keep it secret in real life.
Can you tell us what exactly are you trying to achieve here?