The spelling of the word "McMonagle" is derived from Irish Gaelic. The first syllable "Mc" indicates that it is a surname meaning "son of." The second syllable "Mon" has a short "o" sound as in "hot" and it means "hill." The third syllable "a" has a short "a" sound as in "cat." The fourth syllable "gle" has a hard "g" sound as in "goat" and a short "e" sound as in "get." Therefore, "McMonagle" is pronounced as /məkˈmɑnəɡəl/.
There doesn't seem to be any widely known or documented etymology for the word "McMonagle". It is likely that "McMonagle" is a surname with Irish or Scottish origins, as the prefix "Mc" typically signifies "son of" in Gaelic languages. However, without more specific information or historical context, it is difficult to determine the exact etymology of this particular word.