Buddhist Dhammapadha a brahmana is one who has realised the Dhamma

Chapter XXVI - BRAHMANA VAGGA - The Brahmana

PURE IS HE WHO IS TRUTHFUL AND RIGHTEOUS

PURE IS HE WHO IS TRUTHFUL AND RIGHTEOUS

Na jatahi na gottena na jacca hoti brahmano
Yamhi saccan ca dhammo ca so suci so ca brahmano. [393]

Not by matted hair, nor by family, nor by birth does one become a brahmana. But in whom there exist both truth¹ and righteousness, ² pure is he, a brahmana is he. [393]

XXVI:10 A brahmana is one who has realised the Dhamma

Once, a brahmin ascetic thought that the Buddha called his disciples 'brahmana' and that being a brahmin by birth he should also be called a 'brahmana.' Thinking thus, he went to see the Buddha and put forward his view. The Buddha did not accept his view and said, 'O brahmin, I don't call one a brahmana because he keeps his hair matted or simply because of his birth. I call one a brahmana only if he fully comprehends the Four Noble Truths.'

Notes:

The realization of the four Noble Truths.

Here Dhamma refers to the nine supramundane States - the four Paths, the four Fruits, and Nibbana.