Hé Kǎi 何楷, zì Yuánzǐ 元子, was a late-Míng / Southern-Míng official and philological Yìjīng and Shī-classicist from Zhāngzhōu 漳州 (modern Fújiàn 福建). He passed the jìnshì examination in Tiānqǐ yǐchǒu 天啟乙丑 = 1625 and rose to Supervising Secretary of the Office of Scrutiny for Personnel (Lìkē jǐshìzhōng 吏科給事中). Under the Southern-Míng Lóngwǔ emperor (Táng-prince Yùjiàn 聿鍵, r. 1645–1646) at Fúzhōu, he was appointed Minister of Rites; he soon came into conflict with the dominant warlord Zhèng Zhīlóng 鄭芝龍 and died of indignation around 1645–1646.
His major works include the Gǔ Zhōuyì dìng gǔ 古周易訂詁 (KR1a0113) — a sixteen-juàn philological Yì commentary completed in Chóngzhēn guǐyǒu 崇禎癸酉 = 1633 while he served as a tax-management official in the Wú region — and the Shī jīng shì wén 詩經世本古義 (a major Shī commentary). Both works are characterized by extensive philological apparatus drawing on the entire Hàn-Jìn-onward tradition without committing to one school.
CBDB has no securely identifiable entry for him; the entries 18793 (no dates) and others under the same name lack disambiguating particulars. The death-year 1645 is conventional based on the Southern-Míng court chronology.