When posting a query, more information is needed. If you can provide an aproximate date of birth/death and a more specific location if possible this assists others in finding information for you.
If you can add information regarding spouse, parents, children, even a religion can help, but with just the name and location which has been settled for more than a couple hundred years, it is nearly impossible to narrow it down to a specifc person with a common name like Lockhart.
Please add some more information and help will be available. Thanks.