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The surname Mullaly is of Irish origin. It is derived from the Gaelic name "Ó Maolalaidh," meaning "descendant of Maolalaidh." The prefix "Ó" indicates "descendant of," while "Maolalaidh" is a personal name derived from the Gaelic elements "maol," meaning "bald" or "tonsured," and "alaidh," meaning "sage" or "wise."

Like many Irish surnames, Mullaly likely originated as a patronymic surname, indicating descent from a male ancestor named Maolalaidh. Over time, as surnames became hereditary, the prefix "Ó" was often dropped, resulting in the surname Mullaly.

As with any surname, the meaning and origins of Mullaly may vary slightly depending on regional dialects and family histories.