"dāsa" came from the name of the late venerable Thai Buddhist Monk called "Buddhadāsa Bhikkhu".
The word "dāsa" itself means "slave" or "servant". It's the word from an ancient language called "Pali" which is the language that Buddhist monks use in chanting and in their regular rituals or ceremonies. We chose this name because it conveys the meaning that all book lovers are "slave" in the sense that they can't live without books or reading. The name also has a nice Asian touch to it and is also quite catchy.
Read more about Buddhadasa Bhikkhu at http://www.suanmokkh.org and http://www.buddhadasa.com