阿春

The prefix 阿 (ā-) plus a single character from a person's given name produces a warm, casual nickname - the southern Chinese / Cantonese / Taiwanese counterpart of 小 + name. 阿春 is the kind of name a parent or close friend would use for someone whose given name contains 春. Famous in fiction: 阿春 is a recurring stock character name in Hong Kong films, and Kenji Mizoguchi's 1952 film 《西鹤一代女》 has a heroine named O-Haru, often translated as 阿春 in Chinese.

Strictly informal/intimate. Using 阿春 with someone you've just met would feel oddly familiar - reserve for family, childhood friends, or fiction.