"Variant of Umar"
The name Oumar is commonly a male name from the "Arabic" origin.
Oumar is a West African spelling of Umar, the Arabic name also written Omar. The opening Ou- follows French spelling conventions, in which ou stands for the vowel written u in English and in standard Arabic transliteration. This spelling is the usual one in francophone West African countries such as Senegal, Mali and Guinea.
Umar means "Long life, First son, Most high, Follow of the prophet, speaker.".
The pronunciation of Oumar is oo-MAR.