The standard reference on the Yurok language is the grammar by Robins (1958).
Concerning etymology of Yurok (a.k.a. Weitspekan), this below is from Campbell (1997):
Notable is the lack of plain ; the alveolar fricative is a lateral .
The glottalized approximants may be realized as creaky voice on the preceding vowel, a preceding glottal stop, or both. They are often devoiced when they occur at the end of a word.
Campbell, Lyle. (1997). American Indian languages: The historical linguistics of Native America. New York: Oxford University Press.
Dixon, Roland; & Kroeber, Alfred L. (1913). New linguistic families in California. American Anthropologist, 5, 1-26.
Goddard, Ives. (1975). Algonquian, Wiyot, and Yurok: Proving a distant genetic relationship. In M. D. Kinkade, K. L. Hale, & O. Werner (Eds.), Linguistics and anthropology in honor of C. F. Voegelin (pp. 249-262). Lisse: Peter de Ridder Press.
Goddard, Ives. (1979). Comparative Algonquian. In L. Campbell & M. Mithun (Eds.), The languages of native America: Historical and comparative......