This has been asked before at the old forum (which the regulars here have left, for good reason). Here are a few ways of saying it in Irish which were posted there:

bíodh sé (mar atá sé)
let it be (as it is)

bíodh amhlaidh
let it be (so/thus)

lig dó
let it be (leave it alone)

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

"Let it be" isn't an easy one in Irish, but what Caoimhín has given looks workable.

For "stand strong", perhaps:

Seas go daingean "Stand fast/steadfastly"

Await correction or confirmation ...

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[hr]Múinteoir Gaeilge - Irish Teacher[/hr]
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Thank you both so much you have been very helpful. To Caoimhin, in reference to the first phrase would you include what is written in the parentheses ?

I can remember
Fág mar atá

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Bí cinnte de go nglacfaidh triúr le gach aistriúchán a thabharfar.
Be sure to get three in agreement with a translation given.

What does the above translate to in English ?
Thank you
Donna

Fág mar atá sé "leave it as it is"

In the Irish translated version of "Let it be" by the Beatles, its "lig do scíth".

Lig do Scíth literally means "Let you be at your leisure" i.e. relax.

Cian

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Please wait for corrections/ more input from other forum members before acting on advice

It's a matter of choice, but it probably makes more sense with the whole thing:

bíodh sé mar atá sé
let it be as it is

The phrase bíodh sé might be seen as a bit vague by itself, without a context.

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

Thank you for your help.