Star of the sea or drop of the sea
Marily is a rare variant of Mary or Marilyn, likely influenced by the French name Marie or the combination of Mary with the suffix -ly. It carries the traditional maritime associations of the name Mary, often interpreted as 'star of the sea'.
Less common today
Marily isn't in the latest US Top 1000. It last peaked at #3,743 in 1997.
US births per 5-year period, 1990βpresent (SSA data).