User blog comment:Omega natsu2/Chapter 387: Tartarus Arc, Part 4: Father and Son, Predictions./@comment-4829046-20140606063057/@comment-4829046-20140606084201

@Carrot Which is why people generally use just "Roach". And true, its meant not to sound like a nice word since the animal in question is regarded with disdain. :D

Heck, plenty of names are like that. Coconut translates to monkey-face after all XD

But just for clarification, here - The name "cockroach" comes from the Spanish word for cockroach, cucaracha, transformed by English folk etymology into "cock" and "roach".