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I got two for Altaria and Leafeon.
Altaria: Humilis
Named after cumulus humilis, a type of cloud. Altaria's Dex entries also talk about it humming and how it can learn various singing moves, and humilis has the word hum in it. Autistic, I know.
Leafeon: Foxtail
Named after how it looks like a fox, as well as the actual plant.