My results, where did the bengali come from I wonder?

I'm from Liverpool, my grandads mum on my mom's side was Scottish, my nans family on my mums side where from Ireland and my dad's side came from England, Wales and Greece. I was not suprised by the nordic since Northern England still has a lot of viking dna. I was not expecting it too be that high in Scottish and am suprised with how little Welsh there was, what I am absolutely puzzled on though is where the bengali came from, my half brother also did a test on 23 and me and got the same, so obviously someone on my dad's side somewhere down the line came from that region which is interesting.