View the highest/lowest earning families in The United States

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

The surname Koiwai occurs in Japan more than any other country or territory. It can be found in the variant forms:. Click here for other possible spellings of Koiwai.

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

Koiwai is the 124,423^rd most widespread family name at a global level, held by approximately 1 in 1,988,959 people. The last name is primarily found in Asia, where 98 percent of Koiwai live; 98 percent live in East Asia and 98 percent live in Nippono-Asia.

Koiwai is most frequently used in Japan, where it is held by 3,596 people, or 1 in 35,552. In Japan it is most frequent in: Nagano Prefecture, where 25 percent reside, Saitama Prefecture, where 21 percent reside and Tokyo Metropolis, where 18 percent reside. Outside of Japan Koiwai exists in 9 countries. It is also found in The United States, where 1 percent reside and Papua New Guinea, where 0 percent reside.

Koiwai Last Name Statistics ^demography

In The United States those holding the Koiwai last name are 13.44% more likely to be registered Democrats than the national average, with 66.67% being registered with the political party.

Koiwai earn somewhat more than the average income. In United States they earn 8.56% more than the national average, earning $46,842 USD per year.