This is pretty cool. It's an index of several million book translations that have been published, and allows you to view origin language, target language, frequency, author...

I'm currently viewing languages by number of translations out of them, and there's some real oddities: Swedish is the starting point for more translations than Japanese, Chinese or Portuguese; there are more books translated from Estonian than from Persian; Hindi is outdone by Icelandic.

Icelandic is an interesting case... iirc Iceland has more authors per capita than anywhere else in the world and a very voracious reader's market. (Here's a citation: the Beeb.) Given this, and when you consider the ubiquity of multilingualism in both India and Iceland, it's not really surprising that Iceland comes out on top for translations. Being more literate helps too; Iceland is 99% whereas India as a whole is 74.4%.

English is the most popular language in translations to Catalan; nothing weird there, but I like that Ancient Greek (actually "Greek, Ancient to 1453") is in the top 10 but not modern Greek.

Curiousity: Galician appears as "Gallegan".