Nine Daughters of Ægir and Rán
In Norse mythology, the Æsir goddess Rán and the jötunn Ægir both personify the sea, and together they have nine daughters who personify the sea waves, the name of each one of the nine sisters being poetic terms for sea waves. The sisters are attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources; the Prose Edda, composed in the 13th century; and in the poetry of skalds. Scholars have theorized that these daughters may be the same figures as the nine mothers of the god Heimdallr.