It certainly makes sense that this muscle's name is from the Latin for "largest rump"
[DOC] [TLE] Jeopary Questions page 1268 - 2-LETTER WORDS - TriviaBistro.com [PAR] MUSCLING IN: It certainly makes sense that this muscle's name is from the Latin 
for "largest rump"  HODGEPODGE: This Lillian Hellman play gets its title from a... [DOC] [TLE] The Lover's Tongue - Scribd [PAR] This sense of the word is still familiar, especially in phrases such as mother .... 
For instance, in the seventh century, English adopted a few Latin words from the 
..... saw the emergence of strip, a word which not only meant to make naked but 
also ...... source meaning largest rump, there being three differently-sized 
muscles in... [DOC] [TLE] morphemes.