Brahmaa sahampati is a 'brahma' according to the Buddha's vision of the world (lokadhaatu). Number of such Brahmaa is mentioned; for example, sana.nkumaara, baka. They are mere names; of course one can try to give meanings to them. However, they are proper names. Giving meanings to them is not very fruitful.
PTSD gives the following information about Brahmaa = Brahman:
Brahmā [cp. Vedic brahmán, m., one who prays or chants hymns, nom. sg.
Brahmā] 1. the god Brahmā chief of the gods, often represented as the creator of
the Universe (vasavattī issaro kattā nimmātā) D i.18; iii.30, also called Mahābrahmā (D i.235 sq., 244 sq.; iii.30; It 15.
Brahmaa is a Vedic God and not related to the 'Brahmaa's' mentioned above. As far as Vedic gods are concerned, they are blind beliefs as far as the Buddha is concerned.
D. G. D. C. Wijeratna
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