I know, but it sounds so good...
besides, back when that happened, the M was added to differentiate, and nearly predates the current boy's dad coming on board. As such, google fact checking is also going to be 2nd/3rd hand "facts", at best. Why start doing it at all, before it morphed into tradition, was to differentiate...my story, anyhow...and as to the why as well, or, am in the ballpark, anyhow...I like stories.