This isn't standard by any means, but it does happen commonly. It's really dependent on the office and company culture. I'd say try to figure out if the other doctors there have historically gotten gifts for staff. If they have, and you feel comfortable continuing the tradition, go for it. If it doesn't already occur regularly at your clinic, my advice would be to not do it. You'd be setting a precedent, could potentially make staff feel like they need to reciprocate, and could make other doctors feel like they need to start doing gifts as well. If you want to show your appreciation for staff or wish them a merry Christmas, a personal note or card is really meaningful.