I run a daily etymology-based word game and use EtymOnline as my primary source. Today, I happened to pick the word “ceviche” for one of my puzzles and was surprised to discover that EtymOnline lacks an entry for this term. Just thought I’d draw it to your attention.
There’s potential material on Wiktionary (under “ceviche” and “cebiche”) as well as in the Wikipedia entry.
I wish I could have written and submitted an entry myself, but I’m a game developer, not an etymologist, so I’m not equipped to differentiate one person’s good theory from someone else’s crazy notion.