Naval

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late Middle English: from Latin navalis, from navis ‘ship’.

wiktionary

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From Middle English naval, from Middle French naval, from Latin nāvālis; equivalent to navy +‎ -al.

etymonline

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naval (adj.)

"of or pertaining to a ship or ships," specifically "pertaining to a navy," early 15c., from Old French naval (14c.) and directly from Latin navalis "pertaining to a ship or ships," from navis "ship," from PIE root *nau- "boat." An Old English word for "naval" was scipherelic.