Aare-nboowa, Renbowa (Reinbow, Rainbow) meaning "Aare covers, shields, surround, form an arch, bow around us".
Olodu-to-mo-Aare meaning the "Lord of mystery that moulded/created Aare". Aare meaning is "wonder", Olodumare is the Olojo meaning "Creator of the days". Aare is Olodumare covenant to the children of Odu-to-ni-iwa, Odunuwa, Dunuwa, Niah, Nuah, Naah, Noah, Oduduwa-Adua, Duwadu (David) and the world. Ajoyo, Joyo (Joy, joyous) Ojo'Ubile, Jo'Ubile, J'ubile (Joy of Jubilee) is the day of celebration of odun Olojo-Ubile meaning "celebration of the day of the Lord of creations".
According to the bible, year of Ojo-Ubile, Jo'Ubile, J'Ubile (Jubilee) must be celebrated every year to renew Olodumare's covenant with omoNoahbi the Yoruba tribe.
According to Genesis, after Noah's flood God put the rainbow in the sky as the sign of His promise that He would never again destroy the earth with flood (Genesis 9:13–17):
Book of Ojo'Ubile, Jubile (Jubilees) charpter 6:
15 And He gave to Noah and his sons a sign that there should not again be a flood on the earth. 16 He set His bow in the cloud for a sign of the eternal covenant that there should not again be a flood on the earth to destroy it all the days of the earth. 17 For this reason it is ordained and written on the heavenly tablets, that they should celebrate the feast of weeks in this month once a year, to renew the covenant every year.
From Google: rainbow (n.) Old English renboga; see rain (n.) + bow (n.). Common Germanic compound (Old Frisian reinboga, Old Norse regnbogi, Swedish regenbåge, Dutch regenboog, German Regenbogen). Rainbow trout (1876, American English) so called for its resplendent colors. Old English also had scurboga "shower-bow."