Yasui
Yasui (written: 安井 or 保井) is a Japanese surname. Notable people with the surname include:

, Japanese judge
, Japanese swimmer
, Japanese politician
, Japanese businessman
, Japanese biologist
, Japanese voice actor
, American lawyer
, Japanese politician
, Japanese photographer
, Japanese Go player
, Japanese Go player
, Japanese actor
, Japanese Confucian scholar
, Japanese painter
, Japanese economist
, Japanese footballer
, Japanese fencer