First found in Saxony, the German surname of Oster has many variations.
Oblea is a Mexican dessert. It begins with the letter o.
Omaha
because it starts with a sound
Omar Vizquel, Orlando Cabrera and Octavio Dotel are three players whose names begin with O.
Operations
0bama
Obsession
Orc
Olive Olwen
Ox.
Odey from Garfield
Oslo
oboe
Orchid
outlaw
ore ida
It is an oblong which is another name for a rectangle.