Of the thousands of surnames which have been identified from historical texts prior to the modern era, most have either been lost (see extinction of family names) or simplified. Historically there are close to 12,000 surnames recorded including those from non-Han Chinese ethnic groups, of which only about 3,100 are in current use, a factor of almost 4:1 (about 75%) reduction. A 2019 figure however put the total number of Chinese family names at 6,150. Of Han Chinese surnames, the largest number ever recorded was 6,363 (3,730 single-character surnames, 2,633 multiple-character surnames), around 2,000 of which are still in use. Chinese Surname extinction is due to various factors, such as people taking the names of their rulers, orthographic simplifications, taboos against using characters from an emperor's name, and others. A recent example of near surname extinction is the rare surname Shan (𢒉). The character may not be displayed on computer systems used by government officials, and people born after the system change as well as people who want to avoid possible problems changed their name to another character such as Xian (冼). The name is still used the older people but some people from the village are concerned that future generations will forget their name origin.