Carlyle, Warburg Pincus and a host of global investment firms plan to beef up headcount in Japan as deals surge, but the country's relatively low number of buyouts for much of the past two decades has made it tough to find people with expertise.

Carlyle, which has been investing in Japan for more than two decades, raised $2.8 billion (¥430 billion) for its fifth and largest Japan buyout fund in May.

It wants to add 10 more people to its local 25-strong investment team in the next two years, said Takaomi Tomioka, the firm's co-head of Japan.