SINGAPORE, Nov 29 (Reuters) - Oversea-Chinese Banking Corp (OCBC), Singapore's second-biggest lender by assets, said on Wednesday it had appointed Wang Ke as the chief executive of its Hong Kong unit, effective from Dec. 15.

OCBC, which is also Southeast Asia's second-largest bank by assets, said current CEO Ivy Au-Yeung will retire on Dec. 31.

The move came in after Wang's appointment as OCBC's head of Greater China on Nov. 1, which will see him leading OCBC's Greater China market that comprises three banking units in Hong Kong, mainland China and Macau.

The three banking subsidiaries have more than 4,600 staff across 66 branches and offices, according to OCBC.

OCBC announced in July its strategy to unify its brand across its core markets of China and Southeast Asia to capture the growth opportunity there, a strategy with which it expects to deliver an additional revenue of S$3 billion ($2.26 billion) by 2025.

OCBC Wing Hang China changed its name to OCBC China following a regulatory approval on Nov. 24, the lender said on Wednesday.

($1 = 1.3293 Singapore dollars) (Reporting by Yantoultra Ngui; Editing by Sherry Jacob-Phillips)