(Passerellidae; syn. Passerella † American Tree Sparrow P. arborea) Genus Spizella Bonaparte, 1831, sparrow; Gr. -οιδης -oidēs  resembling; "Multiple studies now corroborate that the genus Spizella is polyphyletic; hence, S. arborea and the rest of Spizella belong in separate genera.   ...   Spizella arborea has been previously placed in seven other genera: Emberiza, Fringilla, Passer, Passerella, Passerina, Spinites, and Zonotrichia  ...  However, S. arborea is not the type species of any of these genera  ...  Because no generic name is currently available for the American Tree Sparrow, we describe a new genus:  Spizelloides, gen. nov.   Type species. Fringilla arborea Wilson, currently Spizella arborea.   Included species. Spizelloides arborea (Wilson) comb. nov., American Tree Sparrow.  ...  Etymology.  The generic epithet Spizelloides is formed from the sparrow genus Spizella and the Greek suffix -oidēs (resembling; Brown 1956).  The name alludes to the evolutionary convergence in plumage, morphology, and behavior that led to Spizelloides arborea being considered a Spizella sparrow for many years.  The gender of Spizelloides is feminine." (Slager & Klicka 2014); "Spizelloides Slager and Klicka, 2014, Zootaxa, 3821 (3), p. 399.  Type, by original designation and monotypy, Fringilla arborea A. Wilson, 1810." (JAJ 2020).

L. arboreus  arboreal, of a tree  < arbor, arboris  tree.
● "61  ANAS.  ...  arborea.  38. A. grisea, capite subcristato, abdomine albo nigroque maculato.  Anas fistularis rufus, rostro nigro, occidentalis. Edw. av. 193. t. 193.  Anas fistularis arboribus insidens. Sloan. jam. 2. p. 324. t. 272. Raj. av. 192.  Habitat in America." (Linnaeus 1758) (Dendrocygna).
● "93. ALAUDA.  ...  arborea.  3. A. capite vitta annulari alba cincto.  Alauda rectricibus fuscis: prima oblique dimidiato-alba, secunda tertia quarta macula alba cuneiformi. Fn. svec. 192.  Alauda arborea. Will. orn. 149. Raj. av. 69. n. 2.  Habitat in Europa, gregaria volitans." (Linnaeus 1758) (Lullula).
● "TREE SPARROW.  FRINGILLA ARBOREA.  ... If disturbed takes to trees, like the White-throated Sparrow, but contrary to the habit of most of the others, who are inclined rather to dive into thickets" (A. Wilson 1810) (Passerella).