Cape Mertens (64°32’N, 172°25’W) east of the Chukotka Peninsula at the exit from the Senyavin Straits is named in his honour, as is the ctenophore genus Mertensia created by Lesson in 1830 and the family Mertensiidae by Louis Agassiz in 1860, as well as many specific names. The plant genus Mertensia is in honour of his father.
