Several Latin names of modern countries end in -landia if the corresponding English name ends in -land: Islandia, Nederlandia, Irlandia, Thailandia, Finlandia (also Finnia). England has a much older Latin name, and it is different: Anglia. I do not know of any region name ending in -landia in antiquity.
Where does the -landia suffix come from? Is it related to Latin? My impression is that it is the Germanic word land used in names of countries and regions, adapted to Latin by adding -ia. Is there an alternative for -landia in more classical Latin style?