Origins & NameI would argue Noivern's design is most heavily based on a wyvern. A wyvern is a type of dragon that has only two legs. Rather than having four legs like a standard western dragon, a wyvern's wings exist in place of a front pair of legs. Wyverns also typically have barbed tails. Clearly then, Noivern's design matches a description of a wyvern well. Noivern also appears to have some bat origin as well based on its behaviors and abilities. It uses ultrasonic waves to travel and is a very efficient hunter in the dark. The fluff around Noivern's neck is likely more inspired from bats than a scaly wyvern, too. In addition, some types of bats have ears that look disproportionally larger than their heads, which could have served as some inspiration for Noivern's ears. The inside of Noivern's ears also look like giant speakers. This makes sense considering they emit powerful sound waves with the ability to crush boulders!
Noivern's English name is likely derived from a combination of "noise" and "wyvern." Noivern is classified as the Sound Wave Pokémon and has a variety of attacks relating to sound and noise. As described above, Noivern's basic design is similar to that of a wyvern. Therefore, a "noise wyvern" is a fitting name for such a Pokémon! Noivern's Japanese name is オンバーン (Onbaan), which has a similar connotation. 音 (on) means sound and バーン (baan) is a shorted form of ワイバーン (waibaan), meaning wyvern.