In books there are several sellswords companies, among them two fighting for Daenerys: Second Sons and Stormcrows. Daario Naharis is one of three co-captains of Stormcrows, Second Sons are under command of Mero. In the TV show however, there is one company, Second Sons, under Daario Naharis command. Why was this change made? If the main goal was to simplify things a bit, why didn't scenario writers just remove Second Sons from the show? Why merge them, by keeping Stormcrows plotline (Daario Naharis killing the other two co-captains etc.) and Second Sons name?
The name change may be due to the similarity with the Stone Crows, a hill tribe that Tyrion encounters in Season One.
This would be consistent with other name changes by the show, such as changing Asha Greyjoy to Yara Greyjoy to make the name less similar to Osha the Wildling:
David also confirmed reports that producers are working on changing the name of Theon Greyjoy’s sister, who in the books is called Asha. “We’re a little bit worried about the Osha/Asha sounding too close together,” David said, making a reference to the Season 1 wildling character. “So it might be a slightly different name."