[Ger-Poland-Volhynia] Elisabeth and Luise

[gpvjem]

    There appears to be a considerable frequency of interchangeability between the given names of Elisabeth and Luise in German Lutheran church records from Poland.
    For example, a birth record might indicate the child's name as being Elisabeth but in a death record it might be recorded as Luise.  This occurs frequently enough to make one believe there is some sort of connection between the two names.
    Does anyone have a likely explanation for this?

With many thanks,
John Marsch