I hate to bring Dragon Ball into this but I think it might be a good example. You have the Kamehameha and Chou Kamehameha. Different names, basically the same technique, although Chou is much more powerful. So, Chidori is named because it sounds like a thousand birdy chirping. But, once it's powerful enough to cut lightning, it takes on the name Raikiri. So, the power put behind it can change it's name and possibly it's rank.