Late-Eastern-Hàn philologist and lexicographer, zì Chéngguó 成國, of Běihǎi 北海. Conventionally dated to c. 200 CE on internal evidence in his sole surviving work, the Shìmíng 釋名 KR1j0007. The Hòu-Hànshū gives him no biography. He is associated by tradition with the late-Hàn / early-Three-Kingdoms generation of xiǎoxué scholars whose work culminates in Xǔ Shèn’s 許愼 Shuōwén jiězì and Zhāng Yī’s 張揖 Guǎngyǎ. The Wú-state scholar Wéi Zhāo 韋昭 wrote a lost critique Biàn-Shìmíng 辨釋名, fragments of which survive in citation. A homonymous Liú Zhēn 劉珍 (also of late Hàn) is reported in the Hòu-Hànshū to have composed an unrelated Shìmíng in 50 piān, long lost; Sìkù compilers explicitly distinguish the two.