Lethia \l(e)-thia\ as a girl's name is a variant of Letha (Greek), and the meaning of Lethia is "forgetfulness".

The baby name Lethia sounds like Leithia, Lettie, Letoya, Latoia, Leta, Lethe, Leitha and Letta. Other similar baby names are Bethia, Alethia, Lesia, Lesha, Lecia, Althia, Retha, Betha, Bethea, Bithia, Cathia, Bethie, Kathia, Leia, Lealia, Lelia, Lellia, Leelia, Leonia, Latia, Leecia and Mathia.