How to spell "guer(r?)illa"

From NarratingLandscapes

I've been spelling it with one "r" for three weeks now, but I just noticed that User:Kadupoku is spelling it with two "r"s. I searched some dictionaries, and while it looks like both spellings are acceptable, I think the two "r" version is more correct, since the word is from the Spanish "guerra." I don't want to go back and change all my titles now, so I guess you can blame me for all the guerillas with one "r."

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