Several taxa of birds have been named in his honor, including the Cretaceous genus Alexornis and the tanagers Wetmorethraupis sterrhopteron and Buthraupis wetmorei.
An Alexornis named "Alex" was included in the 2013 animated film Walking with Dinosaurs as a primary character and narrator, voiced by actor John Leguizamo.
Brodkorb described several prehistoric bird genera, such as Alexornis and Titanis, for the first time.