During the Edo period after Tsunahiro, who was Hidenari's son, the Mori clan was granted to use a portion of the first names of the Tokugawa Shogun, and the heirs of the Mori clan used names that employed the last letter of the names of shogun for the half of their names, as 'O元' (However, it was becoming more common to use tsuji, distinctive character used in the names of all of them belonging to a single clan or lineage, such as 'O広,' 'O就,' 'O房,' 'O親,' and 'O熙'.)
秀就の子・綱広以降の江戸時代には偏諱を受ける相手は徳川将軍となり（称松平・賜諱の家格とされた）、世子は元服時に将軍諱の下の字（○）を受け、「○元」などと名乗る習わしであった（しかし、「○元」と名乗る場合はむしろ少なくなり、「○広」、「○就」、「○房」、「○親」、「○熙」など他の通字を使用するケースが多くなった）。