Why are there more people surnamed Wu in Southeast Asia?

Wu people moved to Southeast Asia from the Yuan and Ming Dynasties, when Southeast Asia was called Nanyang. The Chinese family surnamed Wu in the Philippines mainly came from Fujian coastal areas, but also from Guangdong and Taiwan Province provinces, but the migration time was late. According to statistics, at the end of19th century, there were more than 50,000 overseas Chinese in Manila, the capital of the Philippines, among which the population of Wu was the seventh. Since the 20th century, the influence of people named Wu has gradually expanded. Wu Kecheng is one of the founders of Manila Chamber of Commerce founded by 1904. He immigrated to the Philippines from Jinjiang, Fujian. Later, Wu Kecheng became the leader of the local movement to safeguard the rights and interests of Chinese. During the period of War of Resistance against Japanese Aggression, Filipino Chinese organized the Overseas Chinese Anti-Japanese Committee, including Wu Daosheng and others, and its subordinate anti-Japanese guerrilla Fujian team was also commanded by Wu Yang. This shows Wu's influence in the Philippines.