Kojima is a Japanese surname meaning "small island," composed of characters denoting something small and an island. Ranking 60th among Japanese family names, Kojima is distributed nationwide throughout Japan rather than concentrated in any single region. The name reflects Japan's complex geography as an island nation with numerous small islands, inlets, and coastal communities that have historically sustained unique settlement patterns and cultures. The reference to small islands suggests families with ancestral connections to coastal regions, maritime activities, or settlement on islands.

The surname Kojima developed during Japan's feudal period when families adopted names reflecting their geographic locations and environmental surroundings. Japan's archipelago contains thousands of small islands, many supporting distinct communities with separate identities and histories. Families residing on or near these islands naturally inherited names reflecting their island locations. The nationwide distribution indicates that small islands existed across multiple coastal regions, leading to independent adoption of the Kojima surname in different parts of Japan. The Meiji Restoration's mandatory surname registration in 1875 formalized Kojima across the nation.

What makes Kojima distinctive is its connection to maritime geography and island-based communities within the broader Japanese landscape. Small islands held particular cultural significance in Japanese history, often serving as trading posts, fishing communities, or strategic locations. The name carries associations with seafaring traditions, island self-sufficiency, and distinct island cultures. Families bearing this surname frequently maintained connections to maritime activities, coastal trades, or island heritage.

Kojima maintains significant recognition across modern Japan, appearing among individuals in diverse professions and social sectors. The nationwide distribution reflects the widespread presence of Japanese communities with island heritage. Notable bearer Kojima Yoshio has contributed contemporary visibility to the surname. For those interested in Japanese maritime history and island cultures, Kojima provides insight into how geographical isolation and coastal environments shaped family identity and inheritance patterns throughout the Japanese islands.