A person who shares the same name as another is often referred to as a "namesake." This term is used to indicate a connection based on having the same given name, usually when one person is named after the other. For example, if a child is named after their parent, the parent can be considered the child's namesake.
A person or thing with the same name as another is often referred to as a "homonym." In a broader context, such entities can also be described as "namesakes." This term applies to individuals who share the same name, often in honor of someone else, or to objects, places, or concepts that share a name.
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.
To identify a person uniquely and avoid confusion when several people share the same or nearly the same name.
There are many Ryuga Hideki's in this world, but currently, there are no idols that share the same name.
Synonyms.
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.
A person with the same name as you is often referred to as a "namesake." This term is used to describe someone who shares the same name, whether it be first name, last name, or both. It can also apply to individuals who are named after someone else, such as a child named after a parent or relative.
Concentric
An area where residents share a same characteristic is called a homogeneous region.
A person who has the same first and last name is often referred to as a "name twin" or can be described as having a "repetitive name." In some cases, they may also be humorously referred to as a "duplicate" or "same-name." This phenomenon can lead to confusion, especially in legal or official contexts.