The following are sign languages reported to be used by at least 10,000 people. Additional languages, such as Chinese Sign Language, are likely to have more signers, but no data is available. Estimates for sign language use are very crude, and definitions of what counts as proficiency are varied. For most sign languages, there are no concrete estimates. For instance, it has been reported there are a million signers in Ethiopia, but there are only a fifth that number of deaf people, less than half of whom are fluent in sign, and in addition it is unknown how many different sign languages they use.
According to many highly educated members of the ASL Deaf community, the number of fluent ASL native signers is closer to the tens of millions. Therefore, the statistics listed below, while taken from varying published sources, should be carefully vetted before being disseminated or cited elsewhere.
^a Sign-language names reflect the region of origin. Natural sign languages are not related to the spoken language used in the same region. For example, French Sign Language originated in France, but is not related to French. Conversely, ASL and BSL both originated in English-speaking countries but are not related to each other; ASL however is related to French Sign Language.
^b Denotes the number (if known) of languages within the family. No further information is given on these languages.
