Likely a modern blend of Mary and names ending in -ly.
Mairely is a contemporary American creation, most likely formed by combining the traditional name Mary (meaning 'bitter' or 'beloved') with the popular '-ly' suffix found in names like Beverly or Lily. It may also be used within Spanish-speaking communities as a creative variant of Maria or Maite. Because it is a modern invention, it lacks a singular historical etymology.
Less common today
Mairely isn't in the latest US Top 1000. It last peaked at #10,518 in 2009.
US births per 5-year period, 1990βpresent (SSA data).