Check with the sheriff’s department in that county and nearby jurisdictions if necessary. Arrest records and names of jail inmates are public records, and are sometimes available online. If your tenant is in jail and you have no way to contact him, you may be able to sweet-talk the D.A. and get the name of his attorney.
I’m guessing there’s a chance you’ll need to go through the whole eviction process. On the bright side, the weather in Georgia is nice at this time of year and I hear this year’s peach crop was particularly sweet due to the drought.