their hair is the waves.

The Nine Daughters of Ægir & Rán are each named after a type of wave, which probably means they are personifications & manifestations of differing sea tops themselves. Perhaps this artistic interpretation NorsePlays more exactly how that is by making the waves their very hair:

And since Norse & Classical Mythologies are descended from common Proto-Indo-European roots, one can maybe associate the depiction of these sisterly beauties with the idea of Aphrodite being born of seafoam, which is almost equally as curious as Heimdallr having all nine of them as his mothers. Given water's fluidity, perhaps a shared or traded once-a-month foam-lined womb gave the golden-toothed watchman of the Gods his níu-maternal origin. 

[Nine Daughters of Ægir and Rán (2021) by Rim Baudey, graphite on paper & digital mixed media.]

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Guillermo Maytorena IV knew there was something special in the Norse Lore when he picked up a copy of the d'Aulaires' Norse Gods and Giants at age seven. Since then he's been fascinated by the truthful potency of Norse Mythology, passionately read & studied, embraced Ásatrú, launched the Map of Midgard project, and spearheaded the neologism/brand NorsePlay. If you have employment/opportunities in investigative mythology,  field research, or product development to offer, do contact him.