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In page Udayagiri Caves:

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Udayagiri, literally means the 'sunrise mountain'.[4] Udayagiri and Vidisha were a Buddhist and Bhagavata site by the 2nd century BCE as evidenced by the Heliodorus pillar. While the Heliodorus pillar has been preserved, others have survived in ruins. Buddhism was prominent in Sanchi, near Udayagiri, in the last centuries of the 1st millennium BCE. According to Dass and Willis, recent archaeological evidence such as the Udayagiri Lion Capital suggests that there was a Sun Temple at Udayagiri. The Surya tradition in Udayagiri dates at least from the 2nd century BCE, and possibly one that predated the arrival of Buddhism. It is this tradition that gives it the 'sunrise mountain' name.[1]