titleFontFamily: String

Sets the Font Family of Axis Title.

Default: “Trebuchet MS, Helvetica, sans-serif”
Example: “calibri”, “tahoma, “verdana” ..

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisY:{
   titleFontFamily: "verdana",
 },
 .
 .
});
chart.render();