Swedish (Öster) and German: topographic name from
Swedish öster, Middle Low German and Middle High German
oster ‘eastern’, denoting someone who lived to the east of a
settlement or who had come there from the east. In many cases the
Swedish name is probably ornamental.
German: nickname for someone
who had a connection with the festival of Easter (for example, someone
who was born or baptized at that time), from Oster
‘Easter’.
Jewish (Ashkenazic): topographic or ornamental name from
German Ost ‘east’ or ornamental name from German Oster
‘Easter’; compare 1 and 3.
Jewish (eastern Ashkenazic): nickname
from Polish ostry or Russian ostryj ‘sharp’,
‘sharp-minded’.
Dutch: from a Germanic personal name
composed of aust ‘east’ + heri, hari ‘army’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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