Nobody ever deliberately named a spaceship that. The staid and stolid minds that run the companies which design and build spaceships rarely let their minds run to fancy. The only example I can think of is the unsung hero of the last century who had puckish imagination enough to name the first atomic-powered submarine Nautilus. Such minds are rare. Most minds equate dignity with dullness. This ship happened to have a magnetogravitic drive, which automatically put it into the MG class. It also happened to be the first successful model to be equipped with a Yale robotic brain, so it was given the designation MG-YR-7-the first six had had more bugs in them than a Leopoldville tenement. So somebody at Yale-another unsung hero-named the ship McGuire; it wasn't official, but it stuck.