How to use fonts with space in C# windows form to create excel workseet?

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C#

MS-Excel

I use an IEnumerable variable to create an Excel worksheet in C# windows form application. The problem is I can set created worksheet font if the font name has 1 word, ex. 'Arial', but I for font name with space it doesn't work, ex. 'B Mitra'. My code is:

var wb = new XLWorkbook { RightToLeft = true };
var ws = wb.Worksheets.Add("SickIn_formation");
ws.Columns().AdjustToContents();
ws.Style.Font.FontName = "B Mitra";

What I have tried:

I have tried using font name without space and with hyphen, but it didn't work