Kaku is a Japanese surname and a masculine Japanese given name. Notable people with the name include:

Surname:

  • Michio Kaku (加來 道雄, born 1947), American physicist
  • Genji Kaku (郭 源治, born 1956), Taiwanese-born Japanese baseball player
  • Tomohiro Kaku (郭 智博, born 1984), Japanese actor
  • Kento Kaku (賀来 賢人, born 1987), Japanese actor
  • Yuji Kaku (賀来ゆうじ), Japanese manga artist

Given name: