Did a jarl ever have a jarless? Ah. Perhaps not.
The male version of countess is sometimes count. From Wikipedia:
An earl was originally another title, but later came to be equivalent to count:
As Hugo cites in his Wikipedia reference, the title of earl is derived from the Anglo-Saxon title. An eorl was the highest rank below the king in pre-Norman England, and there was no female version of the word. Indeed, the only female noble who had a title at all was the cyninge (queen). There existed a kind of abstract title, but it was pretty broad:
In all my reading about the period I have never encountered a female title of rank corresponding to eorl (itself replacing ealdorman). Indeed, even the famous wife of Eorl Leofric of Mercia, whom you know as Lady Godiva (1004-1080), is simply referred to by her given name, Godgifu.
Given that there was no traditional corresponding title of rank, it is not surprising that one should have been borrowed.