Hello again, Ronel:
Here's out genealogist's full text on these two people:
1) Johann Nikolaus Rosenhayn (1689-1758) and his first wife, Charlotte Juliane Uhrleb (1708-39) are among my ancestors, nine generations back. After his first wife's death:
"II. Mansfeld 6.11.1740 Dorothea Caroline Frölich, get. Mansfeld 26.1.1718 lebt 27.7.1749 (Pate), T. d. Paul F., Akziseeinnehmer in Mansfeld u. d. Bürgermeisterstochter N. Lindau."
"On November 6, 1740, he married his second wife, Dorothea Caroline Frölich, in Mansfeld. She was baptized on January 26, 1718 [likely within two or three days of her birth], and was still alive as of July 27, 1749, when she served as a godmother. She was the daughter of Paul Frölich, a tax official [see https://en.wikipedia.org/wiki/Octroi],
and ____ Lindau, daughter of the mayor."
2) Balthasar Frischmann (1574-1630) was the brother of one of my ancestors, eleven generations ago. Of his wife:
"Freiberg (Petri) 26.5.1606 Judith Frölich, T. d. Sebastian, Pfarrer in Kötzschenbroda."
"On may 26, 1606, he married Judith Frölich in Freiberg (at St. Peter's Church). She was the daughter of Sebastian Frölich, a clergyman in Kötzschenbroda."
It still isn't a whole lot (there's further info on Rosenhayn, Frischmann, and Frischmann's and Judith's single child and three grandchildren). What's odd to me is that over some five-plus centuries and well over a dozen generations, only two people (well, four, with their dads) named "Frölich" show up; it's a great last name, and simply means "cheerful".