The 335 clan names of 'Kobetsu', which were listed at the top of the register, comprised clans that had branched out from the Imperial Family after the time of Emperor Jimmu.
筆頭にあげられた「皇別」の姓氏とは、神武天皇以降、天皇家から分かれた氏族のことで、335氏が挙げられている。