How stupid can you be Ann Brashares?
Even after all these years, I find it incredibly stupid that Ann Brashares decides to set a book in a country she's never been to (Greece) and doesn't even consult a Greek person so see if the name Costos is actually a Greek name. It's not. It's Costas. ONE OF THE MOST POPULAR NAMES IN GREECE. They at least had enough sense to fix it in the movie. I wonder how Alloy Entertainment, the author and the publishers all missed this blatant error. Probably doesn't seem like a big deal to many people but it's still sloppy research and a huge error for the people writing, editing and publishing it.
If you want to understand how bad it sounds to a Greek, think of someone calling someone Bab instead of Bob. Big difference.