Rigvedi: The word mainly denotes one of the two subcastes of Deshastha Brahmin

Brahmin

Brahmin Brahman, Brahma and Brahmin.Brahman, Brahmin and Brahma have different meanings. Brahman refers to the Supreme Self...

 of Maharashtra

Maharashtra

Maharashtra is a state located in India. It is the second most populous after Uttar Pradesh and third largest state by area in India...

 & Karnataka

Karnataka

Karnataka , the land of the Kannadigas, is a state in South West India. It was created on 1 November 1956, with the passing of the States Reorganisation Act and this day is annually celebrated as Karnataka Rajyotsava...

, India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

. The other subcaste is Yajurvedi

Yajurvedi

Yajurvedi: The word denotes one of the two subcastes of Deshastha Brahmin of Maharashtra and Karnataka. The other subcaste is Rigvedi. The word Yajurvedi is derived from Yajurveda, one of the four holy Veda of Hindus....

. The word Rigvedi is derived from Rigveda

Rigveda

The Rigveda is an ancient Indian sacred collection of Vedic Sanskrit hymns...

, one of the four holy Veda (religious texts) of Hindus.
Brahmins of other regions may also have the Rigvedi / Yajurvedi distinction but the words are commonly used to differentiate the Deshastha subcastes.