Macauley is a masculine name of Scottish and Irish Gaelic origin, derived from the Gaelic surname Mac Amhalghaidh, meaning "son of Amhalghaidh" (an ancient personal name). Historically used as a family name, Macauley transitioned to use as a given name following the trend of adopting surnames as first names. The name carries associations with Celtic heritage and has variations including Macaulay, MacAuley, and McCauley. While never reaching top-tier popularity, Macauley saw increased usage in English-speaking countries during the late 20th century. The name received modest attention through association with actor Macaulay Culkin in the 1990s, though his spelling variant has been more recognized. Macauley projects strength and traditional masculine qualities while maintaining its distinctive Scottish roots.

Maclain is a masculine name of Scottish Gaelic origin, functioning as an Anglicized spelling variant of 'MacIain' or 'MacIan,' which literally means 'son of John.' As a surname-turned-first-name, it carries the strong heritage and clan associations common to Scottish patronymic naming traditions. The name has a distinguished, somewhat aristocratic quality while maintaining a contemporary sound. Though rare as a first name, Maclain appeals to parents with Scottish heritage or those seeking a distinctive name with clear cultural roots. The pronunciation may vary, with some saying 'mak-LANE' while others prefer 'mak-lin.' Maclain offers the trendy appeal of surnames as first names while providing a direct connection to Celtic heritage and history.

McDonnell is a masculine name that originated as a Scottish and Irish surname meaning 'son of Donald' or 'son of Donal.' It belongs to one of the oldest and most powerful Gaelic clans, with roots tracing back to Domhnall, a 6th-century Scottish king. While traditionally used as a family name, McDonnell has occasionally transitioned to first-name usage, particularly in families honoring their Celtic heritage. As a given name, it's quite uncommon, giving bearers a distinctive identity. The name carries connotations of strength, heritage, and tradition, and connects its bearer to the rich history of Scotland and Ireland. Its recognizable prefix 'Mc' immediately identifies its Gaelic roots.

McLean is a masculine name derived from the Scottish Gaelic surname Mac Gille Eáin, meaning 'son of the servant of John.' As a first name, it represents the trend of using ancestral surnames as given names, which became increasingly popular from the late 20th century onward. McLean carries strong Scottish heritage connections and projects an intellectual, distinguished quality—possibly influenced by associations with prestigious institutions like McLean Hospital and McLean County in various states. The name remains relatively rare as a first name but has steady usage in families with Scottish ancestry or those appreciating its refined sound. It offers the friendly nickname 'Mac' while maintaining a sophisticated full form. McLean bridges traditional naming conventions with modern surname-as-first-name styling in an understated, elegant way.