When downloading the typeface 'Source Sans 3', the resulting font files list the Font Family Name as 'Source Sans 3 ExtraLight' instead of just 'Source Sans 3' . You can view this is something like FontDrop.info.
So then a resulting bold font may be titled 'Source Sans 3 ExtraLight - Bold', for example. Seems to be the case for any of the weights or styles.
When downloading the typeface 'Source Sans 3', the resulting font files list the Font Family Name as 'Source Sans 3 ExtraLight' instead of just 'Source Sans 3' . You can view this is something like FontDrop.info.
So then a resulting bold font may be titled 'Source Sans 3 ExtraLight - Bold', for example. Seems to be the case for any of the weights or styles.