I have no statistics, and I am afraid there are none. But I have lived in this country for 50 years and never once have I come across that name.
Alois, yes, though rare, too. There is no St.
Aloisia, so no help from that side (unless a girl was named after St.
Alois). Unfortunately my digital version of Seibicke's HDV starts with the letter F; this is where you can find examples for the use of the name.
In my imagination
Aloisia is a woman between 60 and 90.