I think it’s meant to be a bit more profound than a verbal similarity - though of course these were widely thought not to be merely coincidental. We find the same correspondence in astrological texts, too, e.g. in Varāhamihira’s Bṛhajjātaka, Chapter 2 v. 1a, where the seven planets of the ancient world are placed on the macrocosmic man of Time.
The Sun [‘Day-maker'] is the self (ātman) of Time, the Moon [‘Cool-rayed’] his mind (manas), Mars [‘Earth-born’] his courage, Mercury [‘Knower’] his speech, Jupiter [‘Life’] his knowledge and happiness, Venus [’White One’] his desire, and Saturn [‘Son of the Lord of Day’] his suffering.
The Moon has a very important place in Indian astrology, but here perhaps it is regarded as representing a less profound (because more changeable?) level of being than the Sun.
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