From Proto-Tai *ʔoːjꟲ (“sugar cane”). Cognate with Thai อ้อย (ɔ̂i), Lao ອ້ອຍ (ʼǭi), Lü ᦀᦾᧉ (˙ʼoay²), Zhuang oij. Compare Sui uic (“sugar cane”).
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