Well, all the DNS queries you see in your stats are raised by networking applications within your network. If even you don't know what these do, how can anybody else know?
You may run a sniffer like Wireshark to find out what these DNS queries raise. From the structure of the domain name (without TLD) I would think these are queries for an internal network resource (e.g. a printer or NAS) or a badly behaving networking program.