The adress-book of Halle/Saale shows 1888 two entries for PIRL
Pirl F. Karl, Backermeister, Landwehrstra?e 12 (master baker)
- Aug., Schuhmachermeister, Geiststra?e 12 (master shoemaker)
and:
Grothum Marie geb. Pirl, verehel., Fritz- Reuterstr. 2
furthermore - there must have been a Louis Wilhelm Pirl born in Beidersee
(north of Halle)
who emigrated 1850 to St. Louis
B U T - without any exact names and dates nobody is able to help you.
Christine