Translation

papiyon means "Butterfly" or "Moth" in English.
It's a katakanization, a loan-word.
It comes from "Papillon," from French.

papiyon is normally written with katakana, as パピヨン.
papiyon written with hiragana is ぱぴよん.
papiyon does not have kanji.
Romaji pa pi yo n
Katakana
Hiragana

Further Reading

Wikipedia: チョウ (Butterfly)
  1. バタフライ - ja.wikipedia.org, accessed .
oochouzame 大蝶鮫.