That depends on two things.
The first is whether or not the certification is accredited by an institution that matters.
Anyone can create a course and certify that you’re trained to teach their materials.
If you’re big like Dale Carnegie, or Toastmasters, or some prestigious university, then certification from them means something.
The other is what will give you credibility in front of your prospects.
It could be that you’ll need to put some explanation of what the certification means somewhere on your website.
I think that the second thing probably matters more than the first.
Your credentials have to be relevant to your audience.