Vandayar is a surname of royal descent. The "Vandayar" is a subcaste within the larger Kallar caste, which is part of the Mukkulathor(Thevar) community in Tamil Nadu, India.
Notable people with the surname include:
K. Thulasiah Vandayar (1929–2021), Indian politician Rao Bahadur V. Appasamy Vandayar, Indian politician
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