Achim is a male forename and a surname.
Achim (German pronunciation: [ˈaxiːm]) is the German short name for Joachim or Jehoiakim (Hebrew meaning "he whom Jehovah has set up").
In the Bible, Achim is mentioned in Jesus' genealogy as the son of Zadok and father of Eliud (Mt 1:14).
In this case, Achim means presumably "he will make" or "he will set up" in Hebrew (יקים).
A name day is the feast day of a saint after whom a person is named.