In German it’s Steuerbord (meaning the same as starboard) and Backbord (compare Middle Low German ba(c)kbōrt and Dutch bakboort; oldest mention of this form is from old English: bæcbord!)

The word ‘back’ in German meaning ‘back’ in English doesn’t even exist. Only in this one loanword from Low German.

Only today I looked up this word, I never knew or understood that Backbord is literally backboard.