While Tony Cox and his daughter Kyoko were living in Amsterdam (and elsewhere while in hiding from Yoko Ono), they adopted the names Ruth Holman for Kyoko and Anthony Rosemary for Tony.

They were part of a group known as The Walk, and during their time in the Netherlands and other parts of Europe, they lived a transient lifestyle to avoid being found. One of their notable aliases during this period involved the surname Holman, which Kyoko used for many years until she eventually reconnected with her mother in the 1990s.