Pertinent

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late Middle English: from Old French, or from Latin pertinent- ‘having reference to’, from the verb pertinere (see pertain).

wiktionary

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Borrowed from French pertinent, from Latin pertinens, present participle of pertinere(“to extend, stretch out, belong, relate, pertain, have concern”), from per(“through”) + tenere(“to hold”).

etymonline

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pertinent (adj.)

belonging or relating to the subject or matter in hand," "late 14c., from Anglo-French purtinaunt (late 13c.), Old French partenant (mid-13c.) and directly from Latin pertinentem (nominative pertinens) "pertaining," present participle of pertinere "to relate, concern" (see pertain). Related: Pertinently.