Astignite combines the characteristics of a cyclopes, knights, and robots. Its English name is a combination of astigmatism, ignite and knight. Its Japanese name is likely a combination of fire and mine.
Astignite is the most defensive out of all three starter Pokemon, making it a good choice for those who like bulky Pokemon.
As expected, though, because it's so defensive, it offensive stats are lacking, making it obvious that this Pokemon should be used as a wall. This also doesn't help its 4x weakness to ground, so an Earthquake or two can easily knock it out.