I am looking for the Scottish Gaelic translation of "The Celtic drop" or "Drop of the Celts".
Can anyone help, please?

Merry Christmas to all...

Those particular words can be translated literally into Gaelic, but "drop" has more than one meaning in English, and a different word would be used in Gaelic in each case. Are you trying to say "a drop of Celtic blood", or is there some other meaning intended? Also, while it will probably be less ambiguous in Gaelic as to what sort of "drop" is meant, it will still be a somewhat obscure expression, so are you open to paraphrasing?

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

Following up on the responses in the Irish thread concerning this same request in the Irish language, if the Irish Braon fola na nGael worked for you, then in Scottish Gaelic it would be Braon fola nan Gaidheal or Braon fola nan Gàidheal, with an accent added over the "a" in Gàidheal (in Scottish Gaelic, there's more than one way to spell some words, for historic/dialectical reasons).

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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 the quick responses. And thank you for your explanations.
I mean "drop" as in a drop of water.

Maybe another possibility to avoid an obscure expression, what about replacing "drop" with "water". So it would be
"Water of the Celts" etc.

I also responded again in the Irish thread. Here are some Scottish Gaelic possibilities, if you want to use "water" (keeping in mind what i said there about an allusion to whiskey possibly being understood):

Braon uisge nan Gaidheal
a drop of the water of the Gaels

Uisge nan Gaidheal
Water of the Gaels

Braon uisge nan Ceilteach
a drop of the water of the Celts

Uisge nan Ceilteach
Water of the Celts

One other thing to note is that, in Scottish Gaelic, Gaidheal is also the way to say "Highlander", but it can also mean Gaels in general.

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