NEW YORK — Nearly 2 million people around the world became millionaires last year, a year-over-year increase of 15%, as surging stock and home markets lifted the fortunes of the wealthy. The increase raised the number of millionaires to a record 13.7 million.

A report from consultant Capgemini and the Royal Bank of Canada estimated the combined net worth of millionaires at $53 trillion in 2013. That was up 14% from the year earlier — the second-biggest increase since the two companies began issuing wealth reports with comparable data in 2000.