同どう姓せい同どう名めい

noun, noun which may take the genitive case particle 'no'

same full name; identical surname and given name

Refers to two or more people sharing exactly the same family name and personal name. Often used in contexts like mistaken identity or name collisions.

• クラスに同どう姓せい同どう名めいの生せい徒とが二人ふたりいる。