Help! Looking for tips for tough, original boy names

Help, my husband and I can't decide. We're looking for an original, tough-sounding boy's name, but we just can't agree. Last time was also a drama (our son went around nameless for three days), so we're starting early this time, but we can't find a name we both really like. Does anyone have good suggestions? Maybe some objective help would be useful. :-) We'd like to find a boy's name that meets the following criteria:
- original name (you don't know multiple people with that name - not in the top 250)
- not too short (at least 5 letters)
- tough-sounding name
- we often like Scandinavian and truly Dutch names, but it doesn't have to be those specifically

Thanks a lot in advance for your help!