How to Capitalize names

You can do this using the ToTitleCase method of the System.Globalization.TextInfo class:

CultureInfo cultureInfo = Thread.CurrentThread.CurrentCulture;
TextInfo textInfo = cultureInfo.TextInfo;

Console.WriteLine(textInfo.ToTitleCase(title));
Console.WriteLine(textInfo.ToLower(title));
Console.WriteLine(textInfo.ToUpper(title));

Names are tricky. The simple rules of First Letters do not apply. The only sensible approach here is to ask your users how they want it. Anything else can cause offence.

If my name is MacPhearson, ODowel, or just simply marc, Marc or even mArC - then frankly: leave it alone. Trust the user to get it right. This gets even more tricky as you go between cultures.