西スラヴ語群
Slovak is a descendant of Proto-Slavic, itself a descendant of Proto-Indo-European. It is closely related to the other West Slavic languages, primarily to Czech and Polish. Czech also influenced the language in its later development. The highest number of borrowings in the old Slovak vocabulary come from Latin, German, Czech, Hungarian, Polish and Greek (in that order). Recently, it is also influenced by English.