"errant" just means "wandering", from the Latin form iterare. It's where we get, for example, "a Knight errant" (http://en.wikipedia.org/wiki/Knight-errant htt

"errant" just means "wandering", from the Latin form iterare. It's where we get, for example, "a Knight errant" (http://en.wikipedia.org/wiki/Knight-errant http://en.wikipedia.org/wiki/Knight-errant), sometimes spelled "arrant". To be mistaken as 'in error' was a latter meaning which became fused.