Cave Linguam Latinam

Since I have one for Norse, I thought I might as well do Latin...

(Likely) loans from Norse

Gaelic	Irish	Manx	Old Irish	Latin	Latin Meaning	Notes
aba	ab	abb	ap	abbas	abbot
àbhaistear	áibhirseach		adbairt	adversārius	enemy, opponent
àbharsair	áibhirseach		aidbirseóir	adversārius	enemy, opponent
abhlan	abhlann	oalan	ablann	acc. oblātiōnem, from nom. oblātiō	offering
Abraon	Abrán			Aprīlis	April	The Gaelic spelling suggests a possible folk etymology based on braon
abstol	aspal	ostyl	apstal	apostolus	apostle
achd	acht	aghtey	acht	acc. āctum from nom. āctus	apostle
achlais	ascall	aghlish	ochsal	axilla	armpit
adhaltranair	adhaltrach		adaltair	adulter	adulterer
adhradh	adhradh		adrad	acc. adōrātiō	worship
aibidil	aibítir	abbyrlhit	aibgitir	acc. abecedārium from nom. abecedārius	alphabet
aibirsidh				A-per-se	A by itself	via English
aifreann	aifreann	erin	oifrend	acc. offerendum from nom. offerendus	offering
aighear/aighearach	aer/aerach	aer/aeragh	aer/aerach	āēr	air
aingeal	aingeal	ainle	aingel	angelus	angel
àirc	áirc	arg	árc	arca	ark
airgead	airgead	argid	argat			This is actually not a loan from Latin argentum but one of those words which just happen to look very similar in Celtic and Latin.
altair	altóir	altar(agh)	altóir	altāre	altar
annaid	annóid		andóit	antitās	mother church
annaladh	annála		annáil	annālis	annual (adj.)
aoine						see DihAoine
arm	arm	arm	arm	arma	weapon
DihAoine	Dé hAoine	Jeheiney	dia oíne	dia (from nom. dius) + iēiūnum (from nom. ieiūnus)		dius is simply 'day', ieiūnus is an adjective meaning 'fasting'. This was borrowed into Old Irish as oín 'fast day'.