I would be very appreciative if anyone could translate the phrase "Leave No One Behind" into Gaelic for me. I am designing a plaque for my oldest son with this family motto. We're from the U.S. with Scottish and Irish heritage. Thank you so much.

Here is a fairly simple way to say it in Scottish Gaelic (not Irish):
Na fàg air do chùlaibh duine sam bith
"Do not leave anyone behind [you]"

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

Thanks so much! I really appreciate it.