A321
Air Traffic Control Fully Certified
Situational Awareness; Communication Breakdown; Confusion
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
Human Factors
Aircraft X called for taxi; but I must have heard Aircraft Y. I gave taxi instructions to Aircraft Y and did not hear the readback differently and was not corrected by the pilot. I continued to work traffic and when I went back to give the aircraft sequence instructions and switch him to Tower; I realized that he was definitely not an A319. I then asked him to verify his callsign and found out that it was actually Aircraft X; an A321 that I had been giving instructions to. Please advise [airline] that flight WXYZ and WYXZ should not be proposed for departure anywhere near the same timeframe at the same airport.
Ground controller reported mistaking an aircraft with similar call sign with another aircraft.