Who is Molly and Why is Brimstone Obsessed with Her?

Every time Brimstone uses his “Q” ability, he yells “Molly!” Is there some kind of lore behind this, perhaps an ex-wife that left him during his time in the armed forces and he never got over her, so now whenever he is in battle he is painfully reminded? Or maybe it is an easter egg and an upcoming agent’s real name will be Molly something? Curious to hear your thoughts and ideas!

/s hehe