Maybe it's possible to collect host names of connected clients?
I know that Windows and Ubuntu clients send their host names when getting IP from DHCP server (see http://www.held.org.il/blog/2011/01/make-dhcp-auto-update-dynamic-dns/). Also, it's possible to find such information on, say, home Wi-Fi router admin web page (i.e. host names, their IPs and MACs).
Does ESP8266 support getting such information?