Kotlin is named after an island near St. Petersburg, Russia, where most of the Kotlin development team is located. In using an island name, we followed the precedent established by Java and Ceylon, but we decided to go for something closer to our homes. (In English, the name is usually pronounced “cot-lin,” not “coat-lin” or “caught-lin.”)
As the language was approaching release, we realized that it would be valuable to have a book about Kotlin, written by people who were involved in making design decisions for the language and who could confidently explain why things in Kotlin are the way they are. This book is a result of that effort, and we hope it will help you learn and understand the Kotlin language. Good luck, and may you always develop with pleasure!