ZOB center controller reported problems associated with similar call signs.

Attributes
ACN	1630878
Time
Date	201903
Local Time Of Day	0601-1200
Place
Locale Reference	ZOB.ARTCC
State Reference	OH
Aircraft 1
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 12
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

Aircraft X FL330 first on frequency assigned present heading for ewr spacing. +/- 060 heading. Aircraft Y FL350 next on frequency direct slt still in adjacent sector 59 airspace. Aircraft Z FL320 request FL360 cyyz departure southbound. When spacing was achieved for aircraft X; I cleared aircraft Y direct slt by mistake. Thinking separation will be maintained aircraft Z was cleared to FL340. Aircraft X did not turn. Aircraft Z was given two turns eventually a 270 heading to maintain separation from aircraft Y. During this event I descended aircraft Y to FL320 and assigned a 120 heading to proceed direct slt to maintain separation from aircraft Z intended for aircraft X. Aircraft Y left FL350 and turned in adjacent airspace. When the error was noticed aircraft Y left sector 59 (FL330-unlimited) and entered 57 airspace (FL240-FL320). Aircraft Y was climbed to FL330 and turned back on course. Sector volume was 10-12 aircraft. Identify similar sounding call signs sooner.

Original NASA ASRS Text

Title: ZOB Center Controller reported problems associated with similar call signs.

Narrative: Aircraft X FL330 first on frequency assigned present heading for EWR spacing. +/- 060 heading. Aircraft Y FL350 next on frequency direct SLT still in adjacent sector 59 airspace. Aircraft Z FL320 request FL360 CYYZ departure southbound. When spacing was achieved for Aircraft X; I cleared Aircraft Y direct SLT by mistake. Thinking separation will be maintained Aircraft Z was cleared to FL340. Aircraft X did not turn. Aircraft Z was given two turns eventually a 270 heading to maintain separation from Aircraft Y. During this event I descended Aircraft Y to FL320 and assigned a 120 heading to proceed direct SLT to maintain separation from Aircraft Z intended for Aircraft X. Aircraft Y left FL350 and turned in adjacent airspace. When the error was noticed Aircraft Y left Sector 59 (FL330-unlimited) and entered 57 airspace (FL240-FL320). Aircraft Y was climbed to FL330 and turned back on course. Sector volume was 10-12 aircraft. Identify similar sounding call signs sooner.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.