Replace space with   in shortcode result

Hi.
I’m have added a shortcode to a plugin for users to use and insert the blog name in a pre-styled format throughout the website:

Code so far (working):

function dos_cname_function() {
	$i = get_bloginfo('name');
    return '<span class="dos_cname">' . $i . '</span>';
}
add_shortcode('dos_cname', 'dos_cname_function');

I’ve searched around to see if there is any way to add a function to replace any spaces in the blog name with   but haven’t been successful.

In other words, when the shortcode retrieves get_bloginfo(‘name’) and displays the result it will be “My Company Name” instead of “My Company Name”.

Does anyone have any thoughts on how to achieve this (if possible)?

Thanks!