Hiệu is a unisex given name documented in Vietnamese. English Wiktionary records an etymology for it.
Etymology in the sources
Source-reported
Sino-Vietnamese word from 昊. Originally Hạo, but changed to Hiệu due to naming taboo, in order to avoid homophony with the name of Emperor Kiến Phúc's birth name Nguyễn Phúc Hạo. Also see háo compared to hiếu.
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04 / Through time
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05 / A family of names
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Wiktionary text: CC BY-SA 4.0. Wikidata: CC0. Commons recordings retain their individual file licences. Complete attribution is available in each group above and alongside each chart.