the full name of the sword in the valley of the wolves in the series

(see: cumali tekaga)

Mehmet Karahanli's brother is Ali Karahanli. This is stated in Chapter 20 of the video (starting at 20 minutes and 8 seconds).

You don't need to use a fancy title when talking to me. Just calling me a "red sword" is enough because that's what my colleagues call me.

Ali is like a sword. You can watch a video on the internet (site/watch?v=cwiacuslmpy) to see proof of this. The part you need to watch is at the 30 second mark of the 50th minute.

Ali is a reference to a sword, which is a type of weapon.

Ali was the last thing Mehmet Karahanl said before he died. He was shocked to find out that his uncle Aslan had named him after he was kidnapped.