This video shows you how to setup dnsmasq on a Raspberry Pi to assign your network devices static IPs even though they still use DHCP to get their addresses.  You will also be able to access your devices by name instead of IP address.

Written instructions: https://carpie.net/articles/setting-up-a-home-network-dhcp-dns-server-with-dnsmasq

dnsmasq config file documentation: http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html#lbAF