...Name says it all! Is there one? Couldn't find it in the base book.
Keeper of the Veil (from the Pathfinder Companion: Qadira, Gateway to the East)
Benefit: You gain a +1 competence bonus on Bluff and Disguise checks, and one of these skills (your choice) is always a class skill for you.(It IS a regional trait however, that requires you to have spent at least a year of your past in Qadira.)
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I prefer this one:
DM Fiat (from the land of whatever-the-DM-says)
Benefit: Gain a +1 trait bonus on X skill, and X is always a class skill.
Special: Negotiate role-playing reason here.
Why? Because having it be limited to certain skills kind of sucks, and making one up can force the player to make interesting back-story (and the DM can even use it as a hook). If one exists they should take it, but if it isn't readily obvious simply making a new trait that is an exact copy-paste of an existing one - but with a different skill - should never be an issue.
EDIT: This assumes your DM isn't house-rule-phobic, but reminding them that you're giving them an easy "in" to your character should help a bit.