Lockclear again, and still no firm answer. Last time I suggested a version of the English surname Lockyer, "locksmith", but that internal L raises doubts. I don't think a French origin is out of the question, but the best I can come up with is Leclair, and that seems even more doubtful. The search goes on.
For Oxendine try ancestry.com
http://www.ancestry.com/learn/facts/Fact.aspx?fid=10&ln=Oxendine