Rainbow
Irissa is a rare elaboration of the Greek name Iris, who was the personification of the rainbow and a messenger to the gods. It combines the botanical and mythological roots of Iris with a lyrical, feminine suffix. The name evokes the spectrum of colors found in both the sky and the iris flower.
Less common today
Irissa isn't in the latest US Top 1000. It last peaked at #12,194 in 2003.
US births per 5-year period, 1990βpresent (SSA data).