So a namesake is when you are named after somebody. For example, a person named Percy or Perseus might be named after the Greek hero. In a conversation, one would say. "Your namesake, Perseus..." What if it was Perseus speaking? If Perseus was referring to a person named after him in conversation? "You killed the person named after me," is too clunky.
Those might be a little weird to say. The person I plan on saying it has no relation or even friendship to the person who is named after them.
I think that namesake goes both ways. From the online Merriam-Webster: https://www.merriam-webster.com/dictionary/namesake : one that has the same name as another; especially : one who is named after another or for whom another is named His grandson and namesake is the spit and image of him … — Robert Graves
Huh. I don't think I've ever heard it used the other way around and I'd definitely think it was being misused if I did. But then I've also always said "spitting image," not "spit and image," so. Hm.
Well, I'm not sure I'm even going to use it but it just came into my head when I was thinking of a scene to write. The full context is that there is a Titan in Greek Mythology named Pallas, and Pallas Athena as a child killed her best friend by accident who was named Pallas. It's the reason she has the first-name Pallas. I thought a cool scene between Athena and Pallas would be him bringing that up to taunt her. "You killed my ......... Pallas,"