I have a John Boltz (married to Catherine nee Boltz) who is my 3rd great-grandfather. I have no information on him, other than a biography written on their son Jacob C Boltz (in Louisa county, Iowa) stating they are the parents of Jacob C Boltz.

The bio states:

"JACOB C. BOLTZ, contractor and builder, of Morning Sun, Louisa Co., Iowa, was born in Lebanon County, Pa., Feb. 5, 1829, and is a son of John and Catherine (Boltz) Boltz, who, though of the same name, were of no connection. The mother died when our subject was nine years old, and he made his home with his grandparents. At the age of fifteen he was apprenticed to the cabinet-maker's trade, and served a term of one year. In 1857 he was united in marriage with Miss H. J. Jameson, a daughter of John and Margaret (Riple) Jameson, and the same year they came to Morning Sun, where Mr. Boltz opened the first cabinet-shop. He had a partner, Mr. Reistine, for a year, at the end of which time they dissolved partnership, and he carried on the business alone for ten years. At the expiration of that time lie embarked in contracting and building, at which he still continues. In politics he is very liberal, voting for the man whom he thinks will best fill the office and not for the party.

Mr. and Mrs. Boltz are the parents of seven children, two sons and five daughters: Laura Belle, born Jan. 25, 1858; Lenora E., July 28, 1860; John E. E., Nov. 11, 1863; Nellie O., Dec. 20, 1865; Jennie, March 14, 1869; Delia, Jan. 17, 1878; Katie, who died in infancy; and William G., born Dec. 26, 1883.

Mr. Boltz settled in Morning Sun, Iowa, when it contained but a few houses, and the country was almost new. He has lived to see the many great changes which have taken place, and has aided much in the progress and development of the county. He has a nice home and is comfortably located in Morning Sun, where he is highly respected by all its citizens."
From: Portrait and biographical album of Louisa county, Iowa

Jacob and Hannah's daughter, Jennie, married Thomas Hoover - they are my great-grandparents.