Plural form of word "mutex" [closed]

What is the correct plural form of the portmanteau mutex. Is it mutexes or mutices?

From a purely linguistics point of view, the correct usage is mutexes because the word mutex is not Latin in origin. Prescriptivists would wail in anguish if mutices were to enter regular usage.

The -ices usage (e.g., the plurals of index and vertex) is falling out of favor. Indexes and vertexes are both correct usage, for example.

Let their common usage decide...

GoogleFight

Everyone knows that the correct answer is Mutii.

Mutexes. It's correct in a de facto manner--- the vast majority of people (in my experience, certainly) call them mutexes, not mutices, and English is a language that's defined by use. :)