You have no DNS servers configured or you can't reach them. Add some to your /etc/resolv.conf
where 123... is the ip of your nameserver (you can add one or more, one per line). Or, run
depending on which one you have. Or if they "can't be found" or are "unknown commands", try adding /sbin/
in front of the command, i.e. /sbin/dhcpcd
If the latter case works, you can surf "with names" after that, you need to configure your connection to use DHCP to retrieve information.