[jedberg]

https://en.wikipedia.org/wiki/Etsy

"Kalin said that he named the site Etsy because he "wanted a nonsense word because I wanted to build the brand from scratch. I was watching Fellini's 8 ½ and writing down what I was hearing. In Italian, you say etsi a lot. It means 'oh, yes' (actually it's "eh, si"). And in Latin and French, it means 'what if'."[43][44] In Greek, Etsy means "just because"."

[philistine]

In French, the T would have to be silent to be Et si, so it's not that word. There's nothing in French called ett-çi.