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From the little Breton that I speak, it seems quite possible as "Alouarn" could very much be a distortion of "Al louarn" (meaning litteraly "the fox"). As a Breton noun beginning with a "l" tend to change the determiner before it from "ar" (meaning "the") or "ur" ("a") to "al"/"ul" it would explain the double "l" in "Allaire".
It is not mentioned over here but I suppose "Alar" could also come from "Al loar" ("the moon").

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However, if I focused on the sound, "Alar" could come from "Alac'h" (pronounced "A-larh" or for a German speaker "alach") which wouldn't explain the double "l".