त एवैकोनपञ्चाशत्साकं पितृपितामहै: ॥ ६१ ॥
catvāriṁśac ca pañca ca
From those three sons another forty-five descendants were generated, who are also fire-gods. The total number of fire-gods is therefore forty-nine, including the fathers and the grandfather.
The grandfather is Agni, and the sons are Pāvaka, Pavamāna and Śuci. Counting these four, plus forty-five grandsons, there are altogether forty-nine different fire-gods.