Heiki Valgu isa oli metsateadlane Uno Valk, rahvaluuleteadlane Ülo Valk on Heiki Valgu vend. Heiki Valgu abikaasa oli usuteadlane Pille Valk ning nende lapsed on rahvamuusikud Toomas Valk, Katrin Soon ja Kristiina Valk.
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