It is said that Tenkai was from Oshu (Mutsu province), but his family crest was the same as those of the Toyama clan and Miyake clan (Maru ni futatsu bikiryo [two lines in a circle] and Miyake Rinpo [wheel]) and therefore, some say that Kageharu TOYAMA mentioned above became Tenkai.
天海の出自は奥州であるとされるが、使用した家紋が遠山氏と三宅氏の家紋（丸に二引両と三宅輪宝）と同じであるため、上記の遠山景玄が天海にまでなったという説もある。