Traditionally, the sole owner of the feudal rights is called "Lord of X" or "Lady of X", where X stands for the name of the lordship. Originally this title belonged to knights. Since the late Middle Ages the title "Lord" is also used for owners of lordships. In the fourteenth century the lordships of Sinoutskerke and Baarsdorp have formally united. The current owner of the lordship, mrs. M.J. van Huykelom van de Pas, therefore uses the title "Lady of Sinoutskerke and Baarsdorp".
It's important to realize that the title comes automatically with the feudal rights, for the title is a description or synonym of ownership of the feudal rights. By way of comparison: the title 'lessor' belongs to the person who rents out a residential or business space. It's therefor impossible to transfer the right to use the title without selling the rights attached to it. By way of comparison, selling the right to use the title "lessor" without transferring the right to rent out the aforementioned space is an impossibility. Therefor it's not possible to selle the right to use the feudal title without the associated rights associated with it.
Furthermore, the lordship of Sinoutskerke and Baarsdorp is one and therefore cannot be divided in two. This also applies to the title: there is no title that applies to only Baarsdorp or only Sinoutskerke. Nevertheless, there is a family (Van Rossem) that in 1925 bought the right to the title of Sinoutskerke. This is not recognized by the Foundation, because such a sale is historically not possible and it's believed that the buyer was not aware of this and tricked into buying something which doesn't exist.
At the time of the Ancien Régime (until 1795) it was customary to add the name of a lordship to the owner's surname. This is the origin of many dutch double surnames, which should be regarded as a territorial designation and not as a title. Since 1858 the name of a lordship can no longer be officially added to a surname. Surnames can only be changed in the Netherlands by Royal Decree.
Nevertheless, in practice it often happens that owners of lordships informally add the name of a lordship to their family name.