This is the 6974th most frequent Japanese word.
マムドゥ
"マムドゥ" (Mamudu) is likely a transliteration of the name "Mamdouh" or similar names, rather than a standard Japanese word.
The word 'マムドゥ' is used as a proper noun, referring to someone's name with the honorific 'さん'.
マムドゥさんは親切な人です。
Mamudu-san is a kind person.
Here, 'マムドゥ' is a proper noun, referring to an individual, used in casual conversation without honorifics.
昨日、マムドゥと公園で散歩しました。
Yesterday, I took a walk in the park with Mamudu.
'マムドゥ' is again a proper noun, specifically being referenced for discussion, typically using the phrase 'という名前'.