Sidalee is of American origin, a variant spelling of the traditional Irish girl's name Sidelle. It is composed of the elements 'Síd', meaning 'fairy mound' or 'hills', and 'éile', meaning 'other'. Thus, Sidalee could be interpreted as 'otherworldly hills' or 'fairy mounds elsewhere'. This unique spelling and meaning add an element of mystique to the name.
Sidalee is quite uncommon with only sporadic appearances over the years, peaking at just eight births in 2013, but totaling nineteen births between 2007 and 2013.