Sources : Thymallus
Isidore of Seville [7th century CE] (Etymologies, Book 12, 6:29): The thymallus takes its name from a flower – indeed the flower is called ‘thyme’ [thymus] - for although it is pleasing in appearance and agreeable in flavor, still, just like a flower, it smells and exhales aromas from its body. - [Barney, Lewis, et. al. translation]
Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Fish 7.87): Tymallus takes its name from the flower called thyme. It is a fish of the sea, as Isidore says, and although it is pleasing in appearance and pleasant in taste, yet it breathes forth odors like a broken flower. - [Badke translation/paraphrase]