Outside Stratford-Upon-Avon, I see that someone has named their house “Gilead”. The Handmaid’s Tale is not what people fear—it’s their hidden desire.
I haven’t looked into the biblical background of Gilead, except to note that it was ruled by a judge (i.e. an authoritarian form of government). I still take the reference as biblical either way. Potter doesn’t include any explicit Christianity so far as I know, “Tale” does.