Etymologically it is reasonable to understand that the surname 'Asai' of the Omi-Asai (and not Omi-Azai) clan was a result of the phonetic change of the name of 'Asahi-go' village.
近江浅井氏の「あさい」の語源は朝日（あさひ）郷の転化によるものとするのが自然