biblatex: how to abbreviate forenames

Question

I have several full names in my rather large bibiography. Since I do not want to change all these I'd like to have the forename shortened to an initial.

So "Lieschen Mueller" should get "Mueller L.".

I use the standard authoryear style.

Answer 1

Use the package option firstinits=true. (I answered this, among other things, in Guidelines for customizing biblatex styles.)