Echidna's name seems to refer to dangerous creatures, obviously something Echidna is herself. One of the major reasons she hates Volt is because she believes he tries to minimalize her capabilities and power; in other words, he underestimates her.
Echidna's kanji is "wana", which means "trap" or "snare." According to the game book, the official word is "entrapment."
Although most enemies do try to "trap" you, Echidna seems pretty good at trying the hardest to do it in the game. Framing Volt for the murder of Master Mikado is a type of entrapment. Echidna is also hindered, or trapped, by her own hatred for Volt and her need to prove herself as being capable and strong.