So where did the name come from? From an unlikely source, to be sure. You see, jewelry pieces with this design were immensely popular in the 17th century especially. Enterprising craftsmen sold them from tiny booths on Edinburgh's Royal Mile. The booths were locked up tight at night, hence the name "Luckenbooth", or locked booth.
Has it always been a love token? It has always been a love token first and foremost, and was often given as a betrothal gift. But it was also sometimes called a witch-brooch, and worn as a good luck charm. Children were given Luckenbooth charms to protect them from the evil eye, and to keep them from being kidnapped by the fairies.