Where Does The Last Name Theory Come From? ^{nationality or country of origin}

Theory is found most in Afghanistan. It may be found in the variant forms:. Click here for other possible spellings of this surname.

How Common Is The Last Name Theory? ^{popularity and diffusion}

The last name Theory is the 4,908,606^th most widespread last name worldwide, borne by approximately 1 in 455,471,620 people. The surname is primarily found in Asia, where 100 percent of Theory are found; 94 percent are found in South Asia and 94 percent are found in Islamic South Asia. Theory is also the 962,660^th most widespread given name in the world, held by 97 people.

Theory is most common in Afghanistan, where it is borne by 13 people, or 1 in 2,473,322. In Afghanistan it is primarily concentrated in: Nangarhar, where 31 percent live, Herat, where 23 percent live and Kabul, where 15 percent live. Other than Afghanistan this last name exists in 2 countries. It is also common in Iran, where 13 percent live and Israel, where 6 percent live.