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

The surname Theory is more commonly found in Afghanistan than any other country/territory. It may also be rendered as a variant:. For other possible spellings of this last name click here.

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

The last name is the 4,908,606^th most common last name throughout the world, held by around 1 in 455,471,620 people. The last name Theory is mostly 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. It is also the 962,660^th most frequent forename in the world, borne by 97 people.

The surname is most frequently occurring in Afghanistan, where it is carried by 13 people, or 1 in 2,473,322. In Afghanistan it is most frequent in: Nangarhar, where 31 percent reside, Herat, where 23 percent reside and Kabul, where 15 percent reside. Beside Afghanistan this surname exists in 2 countries. It also occurs in Iran, where 13 percent reside and Israel, where 6 percent reside.