Following Rule 51b(4) of the International Code of Nomenclature of Prokaryotes (2022 Revision) (ICNP), the prokaryotic generic name Moorella Collins et al. 1994 is illegitimate, as it is a later homonym of the fungal genus name Moorella P. Rag. Rao & D. Rao 1964 (Ascomycota: Pezizomycotina). Accordingly, as required by Rule 54 of the ICNP, we propose the replacement name Neomoorella and the replacement type species name Neomoorella thermoacetica. We also propose replacement names for the six other species with validly published and not rejected names belonging to the genus Moorella, for one species with effectively but not validly published name and for the family name Moorellaceae and the order name Moorellales.