To be fair, the Akritai was the Byzantine Empire's effort to use the local population to defend the land, instead of having to deploy regular Army or mercenaries. It happened to be Muslim states that was the border. It bears no anti-muslim connotations as a word in Greek. In fact the epic of Digenes Akritas, speaks of Basil, an Akritas of a Greek mother and an Arab father (hence the name Digenes, of two descents).

But still, the name is a bad, uninformed choice.