How do you say ...Your Clan will never leave you behind.... or as close as it gets in Irish...Thank you

Kind of depends on what you mean by "clan." The Irish have never had "clans" in the same sense as the Scots have. Do you mean "family"?

Redwolf

I thought the different 'families' were clans...like the O'Briens, Murphys, ets...that's what I mean by Clan....people of the same name who have joined together.....very extended global family I suppose

http://www.teanglann.ie/ga/fgb/clann

http://www.teanglann.ie/ga/fgb/surnames

In limited circumstances it can have that meaning, but it's rather archaic now.
It would be understood as that in English alright, but in Irish "clann" usually refers to your children or somebody's elses children.

Muintir - is a better word for extended family of many generations.

Ní fhágtha mo mhuintir ar fán mé.

Wait for corrections or other opinions.

Ní fhágfaidh ... a bhí ar intinn agat, nach ea? (Did you mean ...? Same pronunciation)



Ní fhágfaidh mo mhuintir ar fán mé. = My people won't leave me astray.

Ní fhágfaidh do mhuintir ar fán thú. = Your people won't leave you astray.

or:
Ní ligfidh ...

Go raibh maith ad - my spelling is crap.

Yes I meant my family won't leave me straying or wandering or lost. Not exactly leaving behind I know.

Or: Ní thréigfidh do mhuintir choíche thú - 'Your people will never abandon/forsake you.' ('Choíche' = 'never' - missing in the other versions).

That's better than mine.

Go raibh maith agat everybody...The last translation was close to what I wanted ...but I shall use the others...thank you again.