Terminology
Nikkei is derived from the term nikkeijin (日系人?) in Japanese, used to refer to Japanese people who emigrated from Japan and their descendants. Emigration refers to permanent settlers, excluding transient Japanese abroad. These groups were historically differentiated by the terms issei (first-generation nikkeijin), nisei (second-generation nikkeijin), sansei (third-generation nikkeijin), and yonsei (fourth-generation nikkeijin). The term Nikkeijin may or may not apply to those Japanese who still hold Japanese citizenship. Usages of the term may depend on perspective. For example, the Japanese government defines them according to (foreign) citizenship and the ability to provide proof of Japanese lineage up to the third generation - legally the fourth generation has no legal standing in Japan that is any different from another "foreigner." On the other hand, in the U.S. or other places where Nikkeijin have developed their own communities and identities, first-generation Japanese immigrants tend to be included; citizenship is less relevant and a commitment to the local community becomes more important.
Discover Nikkei, a project of the Japanese American National Museum, defined nikkei as follows:
We are talking about Nikkei people - Japanese emigrants and their descendants who have created communities throughout the world. The term nikkei has multiple and diverse meanings depending on situations, places, and environments. Nikkei also include people of mixed racial descent who identify themselves as Nikkei. Native Japanese also use the term nikkei for the emigrants and their descendants who return to Japan. Many of these nikkei live in close communities and retain identities separate from the native Japanese.The definition was derived from The International Nikkei Research Project, a three-year collaborative project involving more than 100 scholars from 10 countries and 14 participating institutions.
Despite claims to the contrary, the Japanese are not exceptional in all respects; therefore, it can be anticipated that new cultural identities will occur within the Japanese diaspora.
Read more about this topic: Japanese Diaspora