Perhaps you should try some spelling variations:
\"siegert\" » \"siegelt\", \"siegent\", \"siegest\"
\"sieger\" » \"siegel\", \"siegen\", \"sieges\"
\"sieve\" » \"steve\", \"siege\"
\"sive\" » \"sie\", \"live\", \"five\"

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( siegert OR sieger ) or ( sieve or sive )).