Etymology
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Words related to inevitable

in- (1)
Origin and meaning of in-
word-forming element meaning "not, opposite of, without" (also im-, il-, ir- by assimilation of -n- with following consonant, a tendency which began in later Latin), from Latin in- "not," cognate with Greek an-, Old English un-, all from PIE root *ne- "not."

In Old French and Middle English often en-, but most of these forms have not survived in Modern English, and the few that do (enemy, for instance) no longer are felt as negative. The rule of thumb in English has been to use in- with obviously Latin elements, un- with native or nativized ones.
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ex- 
word-forming element, in English meaning usually "out of, from," but also "upwards, completely, deprive of, without," and "former;" from Latin ex "out of, from within; from which time, since; according to; in regard to," from PIE *eghs "out" (source also of Gaulish ex-, Old Irish ess-, Old Church Slavonic izu, Russian iz). In some cases also from Greek cognate ex, ek. PIE *eghs had comparative form *eks-tero and superlative *eks-t(e)r-emo-. Often reduced to e- before -b-, -d-, -g-, consonantal -i-, -l-, -m-, -n-, -v- (as in elude, emerge, evaporate, etc.).
evitable (adj.)
c. 1500, from Latin evitabilis "avoidable," from evitare "to shun, avoid" (see inevitable). In modern use, likely a back-formation from inevitable.
inevitability (n.)
1640s, from inevitable + -ity. Perhaps modeled on French inévitabilité.
inevitably (adv.)
mid-15c., from inevitable + -ly (2).
unevitable (adj.)
from un- (1) "not" + evitable. The usual word is inevitable. Related: Unevitably.