Nyarth is possibly a combination of ニャー nyā (the sound a cat makes) and the switched sounds of シャム Syamu (Siam, former name of Thailand), becoming ミャス Myasu. Siam relates to a cat breed, the Siamese, which in turn relates to Nyarth's evolution, Persian, and the Persian cat breed. Su is verbally compatible with th, as s and th are often interchanged in some speech impediments.