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Namesake.
When a person is namedafter another or has the same name as another person we call him/her namesake. The origin is probably the idea of "a person named for the sake of another".
A namesake, if one person was named for the other.
Addict is a general term I suggest you call them by their name, they are still just the same person who has lost their way and in need of help and a friend.
You call them your(or a) contemporary.
They can call the person by name. Or use any subtle name.
call their name and surname together
They call the gay person by his or her name. If they don't know the name, they'll say sir or madam.
You can call them a fellow resident or a neighbor.
Call him/her by name or call information
You call them by their name...
By their name