阿 (ā) is a southern-Chinese / Taiwanese nickname prefix attached to one syllable of someone's given name (
阿强,
阿明,
阿哲).
阿哲 specifically is famous as the longtime nickname of Taiwanese pop star Harlem Yu /
庾澄庆 (Yǔ Chéngqìng), and more recently also for popular mainland livestream host
疯狂小杨哥's circle and various streamers named
哲.
