Personal name stamps, traditionally carved into stone or wood and stamped in red, are still regularly used in Japan, Korea, China and Taiwan to sign official documents.
Above some contemporary applications from artists and designers: Luciano Calderon and Mizu Design use stamps to sign their art works. Hitotoki, on the other hand, composed their logo out of four single stamps, inspired by traditional Japanese name stamps “hankos”, which allows them a certain flexibility to fit the logo into different formats. Underneath a classic Japanese name stamp.

Images from (1)(2) publicdelivery.org, (3) mizudesigns.blogspot.com, (4) (5) hitotoki.org (6) Japanese name stamp photographed by Jason Michael