Mātariśvan
Mātariśvan ("growing in the mother", from the locative of "mother", mātari, and a root śvi "to grow, swell") in the Rigveda is a name of Agni (the sacrificial fire, the "mother" in which it grows being the fire-stick), or of a divine being closely associated with Agni, a messenger of Vivasvat, bringing the hidden fire to the Bhrigus. Sayana identifies him with Vayu, the wind, in RV 1.93.6.