"reindeer" and "rendier".

As I automatically compare English with home language, the word reindeer caught my attention and I looked up its etymology.

I always thought "reindeer" came from " rein "; a deer that could be reined, controlled to pull a sledge.

For Dutch I thought it came from running . Ren means: run and dier means: animal in today's language. I thought "rendier" = : running animal.

In fact in origin it is a reduncancy : animal animal.
That's why I love language. reindeer There is no end to these litttle surprises.