The ubuya not being completely thatched was a childbirth folkway (Okinawa), the ubuya built on the seaside was associated with the demonstration of the spiritual power of the newborn using the mysterious power of water, the fact that the husband asked Toyotama-hime the name of the newborn can be traced back to the system when the mother had the naming rights as in the article of Emperor Suinin in 'Kojiki,' and when Toyotama-hime intercepted Unazaka and the traffic between land and sea came to an end, it was an outburst of a sense of strange land among the ancient Japanese, centered around the area of residence, similar to Yomotsu Hirasaka (the slope that leads to the land of the dead).
産屋を完全に葺かずにおくことは生産習俗であり（沖縄）、産屋を海浜に設けるのは水の神秘的勢能による生児の霊力の証示と関連し、夫がトヨタマヒメに生児の名を問うたのは「古事記」垂仁天皇条と同じく命名権が母に存した制の名残であり、トヨタマヒメが海阪を塞き止め海陸往来が絶えたのはヨモツヒラサカと同じく古代日本人の住域を中心とする異郷意識の発露である。