What do you think is the toughest name and the sweetest name?

Hi, I'm Sharlotte, 21 years old, and pregnant with my first baby girl. Now that we know, I'm looking for a girl's name. I want a tough-sounding name, but I've found a few that I like, and I'm not sure which ones sound sweet and which ones sound tough. So I'd like to ask you all how these names come across to you: which one sounds tough and which one sounds sweet? Yara, Roos, and Sherieke. I'd appreciate your help.