Requested this message board in hopes I might find somebody else out there with Slaar connections. My Great Grandmother was Gertrude Slaar. She was born in the Netherlands, but the family moved to the U.S. when she was an infant. She lived in Michigan (Missaukee County...McBain area). Died in 1964.
Her parents were (I beleive) Jan "John" Slaar, and a Johanna or Hanna. They were both born in the Netherlands, but John's father was born in Germany, so the "Slaar" name may be German, not Dutch. Not sure. If you have any "Slaar" info, I'd love to hear from you.