Asai is a Japanese surname that is derived from the kanji characters meaning "shallow" and "well." It is a relatively common surname in Japan, particularly in the Kansai region. People with the surname Asai are often known for their diligence, patience, and strong work ethic. They are typically seen as reliable and trustworthy individuals who value loyalty and responsibility. Overall, those with the surname Asai are respected for their integrity and dedication to their work and relationships.