A statistical approach to African personal pronouns
Guillaume Segerer & Martine Vanhove - CNRS LLACAN, France

6. m for 1st or 2nd person singular

Nichols & Peterson [WALS] (emphasis added):
First person m (Map 136A) is ubiquitous in the Greater Silk Road area and nearly pan-Eurasian, missing in the Eurasian islands, Southeast Asia, and the Asian Pacific Rim; it is well attested in sub-Saharan Africa and New Guinea, sparsely attested in the Americas, and absolutely absent from Australia.
Second person m (Map 137A) has a solid Pacific Rim distribution with occasional tokens inland in the Americas, in the Eurasian islands, and in Africa; it is absolutely absent from the Greater Silk Road area and Australia.

African data:

 1st pers. m : well attested in sub-Saharan Africa:  2nd pers. m : occasional tokens (...) in Africa:
m lgs 1sg % Comments   2sg % Comments
AA 139 31 22% Chadic only   13 9% Chadic only
NC 493 399 81% All branches except Ijoid and Kordofanian   112 22% Gur, Atlantic, Ubangi, Adamawa. Sporadic elsewhere
NS 96 48 50% All Maban and Central Sudanic only   14 15% sporadic but mainly in Central Sudanic
other 10 3 33% 1 Khoisan, Hadza, 1 Kadugli   1 10% 1 Kadugli
gen. 738 481 65% Niger-Congo and adjacent groups   140 19% Mainly Central Africa, clusters westwards
  > Map   > Map
 <  ALT8 (8th Biennial Conference of the Association for Linguistic Typology), University of California, Berkeley, July 23-26, 2009  >