The word 'Tomokuyu' itself is not seen in the chronicles but since the words 'Tomoku' and 'Yunonagashi' were derived from Tomokuyu, the original Tomokuyu is considered to have existed at that time.
「湯沐邑」という語そのものは見えないが、「湯沐」や「湯沐令」は湯沐邑から派生した語なので、元となる湯沐邑もあったと考えられる。