mail showing odd 'from' name to someone I sent mail to

I send an aquantance (Frank) an e-mail, they respond. In the response at the bottom is: see more from *****, I click on that and it shows my original e-mail with minimal headers. Problem is this header has the wrong name.

Sanitized Sample:

___________________________________________________________

From: BENJAMIN ********* <PH*******@GMAIL.COM>
Date: Sunday, November 12, 2017 at 5:51 PM
To: FRANK ***** <******@******.org>
Subject: Re: **********

My original e-mail

_____________________________________________________________

My name is not Benjamin. I redid this but sent to my wife and had her reply, problem does not replicate. I looked at my gmail account in mail and don't see where the Benjamin part is coming from. Is it Frank's computer messing things up, gmail server, Frank's ISP, Frank's mail app?