Many Ontario cenotaphs used initials instead of given names. An excellent site with full names and details is the Commonwealth War Graves Commission
contact John Allan if you are willing to transcribe a cenotaph or other war memorial for OGSPI
OAKES
OAKLEY
OBOYLE
OBRIEN
ODETTE
ODROWSKY
OFLAHERTY
OGEMAH
OGILVIE
OGRADY
OHARA
OHARE
OLAN
OLDENBURG
OLDRIEVE
OLDROYD
OLIVER
OLMSTEAD
OLSON
OLVER
ONEIL
ONEILL
ONIONS
ONYETT
ORDE
OREILLY
ORR
ORTON
OSBOND
OSBORNE
OSHAUGNESSY
OSTIC
OSWIN
OTOOLE
OUELLET
OUELLETTE
OULD
OVEREND
OVERTON
OWENS
OWLETT
OXLEY