My current "varmint" rig, a Remington Model 7 SS in .223, w/Leupold 1.5-4x scope, is "affectionately" named after its predecessor, as, "Death Ray II".
I don't much care for anthropomorphising or otherwise attributing cute names and such to inanimate objects. In a perverse way, hoplophobes (anti-gunners) do this, that is, imputing an innate evil to simple inanimate tools, by giving them intimidating names --- "assault rifles", "cop-killer" bullets, and so forth.
I guess if you want to call your smokepole "Old Betsy" there's no harm or foul, but let's be careful that we don't acquiesce to the Brady Bunch position, that all guns are "possessed" of some inherent evil force, able to act on its own to do evil, and compel its owner to behave badly.