Kofun are also usually named after a mountain or tumulus at the time of discovery, and such names are the same as the aza (an administrative designation of small sections into which some of the rural districts of Japan are divided) of the location.
古墳も例外ではないが、古墳自体に「○×塚」、「○×山」などの名称がもともと付いていることが多く、字名も同じである場合が多い。