The better-known Germanic form of the name seems to be Halinard:
https://en.wikipedia.org/wiki/Halinard
I am quite sure the second name element must be "hard" (brave, hardy):
http://www.behindthename.com/element/hard
I could not find something about the first one; maybe it's the Old High German equivalent of Old Norse "hallr" (rock):
http://www.behindthename.com/element/hallr