Ugra उग्र

Ugra (Sanskrit उग्र) literally means angry or violent. Ugra also refers to powerful, mighty, fierce, strong, impetuous, passionate, wrathful and rude.

Sanskrit name Ugra founds mention in Unadi-Sutra (उणादि-सूत्र) with meanings like powerful, violent, impetuous and terrible.
Ugra also finds mention in Sir Monier-Williams dictionary where this word refers to high, fierce, savage, angry, passionate and wrathful. This name also founds reference in Epics like Riga Veda (ऋग् वेद), Arthav Veda (अथर्व-वेद), Taittriya-Sanhita (तैत्तिरीय-संहिता) and Ramayan where Ugra means hot, sharp or pungent.
As per reference found in the Mahabharata and Vishnu Purana, Ugra is the name of Rudra or Lord Shiva. Also, it is a name of a son of Dhrtarastra, a Yadava prince and the son of Prajapati Kavi.
Ugra is also name of Lord Vishnu, as he is the source of fear even to the sun, etc.