Any Unknown or Unlisted Aircraft Manufacturer
Air Traffic Control Fully Certified
Air Traffic Control Supervisory 18.5
Confusion; Workload
ATC Issue All Types; Conflict Airborne Conflict
Air Traffic Control Issued New Clearance; Flight Crew Returned To Clearance
Environment - Non Weather Related; Airspace Structure; Human Factors; Staffing; Procedure
I was working all positions combined during the COVID reduced staffing period. Both ZZZ and ZZZ1 were in their north configuration. I had turned Aircraft X to a XXX heading for a vector to the Visual Approach. I had released Aircraft Y on an initial westbound departure heading. During the sequence of events; I had forgotten that Aircraft X was a ZZZ1 arrival; mistaking him as a ZZZ arrival. Both arrivals are vectored in a similar manner to the Visual Approach in this configuration from the north and the Aircraft X call sign made me think ZZZ arrival. The Aircraft Y departure had to build a little altitude before I could turn him north because the temperature was decreasing the climb rate today. I mistakenly cleared Aircraft X for a Visual Approach to Runway XX and then he corrected me with the 'Runway XY' readback. I had planned to go right to Aircraft Y for his turn to the north; but I realized if I didn't correct Aircraft X first; he might turn early towards ZZZ1; so I corrected his heading and altitude first. The lost time; however; resulted in a loss of lateral separation after I turned Aircraft Y to the north.This resulted as a loss of awareness about my aircraft and what they were doing. If I hadn't made the mistake of clearing Aircraft X to the wrong airport in the first place; the sequence would have worked out with enough time to turn Aircraft Y in a timely manner.
TRACON Controller reported that while working traffic at a combined position during COVID-19 reduced staffing period; they experienced a loss of separation.