This question assumes Brahma is not Brahman but is a post that gets filled by different entities over time. Do we know the names of previous Brahmas, like we know the names of many Manus?
Vaishampayana while narrating Hayagriva story, details how Brahma worshipped Narayana.
The Mahabharata, Book 12.: Santi Parva.: Section CCCXLVIII.:
In that Brahma says as follows.:
As regards myself, ...
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