Kaiyo, a masculine given name of Japanese provenance, derives from the characters 海洋, wherein kai (“sea”) and yō (“ocean, world”) collectively reference maritime expanse. Its phonetic rendering /kaɪ.joː/, transcribed via the International Phonetic Alphabet, provides precise phonological guidance for English speakers. In Japanese nomenclature, Kaiyo reflects a modern preference for nature-derived appellations, conveying associations of vastness and elemental resonance. Analysis of Social Security Administration data from 2019 to 2023 reveals annual occurrences between five and eight, corresponding to national rankings between 914 and 935—a quantitative indicator of its status as a distinctive yet viable choice. The name’s technical precision and cool, aquatic connotations appeal to parents who prioritize both phonetic clarity and cultural specificity. Thus, Kaiyo constitutes a calculated selection that bridges Anglo-American phonetic accessibility with the semantic depth inherent in Japanese onomastics.