Edward Sapir (1920) accepted Swanton's proposal and grouped this hypothetical Coahuiltecan into his Hokan stock.
After these proposals, documentation of the Garza and Mamulique languages was brought to light, and Goddard (1979) believes that there is sufficient similarity between them and Comecrudan for them to be considered genetically related. He rejects all other relationships.
Powell's original Coahuiltecan, renamed Pakawan and extended with Garza and Mamulique, has been defended by Manaster Ramer (1996), who also sees a relationship with Karankawa probable and Atakapa as a more distant possibility.
The following table of common core vocabulary constitutes the complete evidence given by Goddard (1979) in support of a Comecrudan family:
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Campbell, Lyle; & Mithun, Marianne (Eds.). (1979). The languages of native America: Historical and comparative assessment. Austin: University of Texas Press.
Goddard, Ives. (1979). The languages of south Texas and the lower Rio Grande. In L. Campbell & M. Mithun (Eds.) The languages of native America (pp. 355–389). Austin: University of Texas Press.
Goddard, Ives (Ed.). (1996). Languages. Handbook of North American Indians (W. C. Sturtevant, General Ed.) (Vol. 17). Washington, D. C.: Smithsonian Institution. ISBN0-16-048774-9.
Goddard, Ives. (1999). Native languages and language families of North America (rev. and enlarged ed. with additions and corrections). [Map]. Lincoln, NE: University of Nebraska Press (Smithsonian Institution). (Updated version of the map in Goddard 1996). ISBN0-8032-9271-6.