Find or make a strong silhouette image

Scale text to fit into the shape.

With the test still selected, choose Make With Mesh

A new window will pop up. You can change the rows and the columns based on what you need. I used 1 row and 4 columns for my name. Select Preview and then OK

Using the Direct Select tool adjust the vertices and modify text to fit in the body of the silhouette.

Adjust the text to fill in your shape.

Expand the text. Select the text, and Object > Expand

I added my first name as well . . .

Select both text groups.

With the text objects still selected, Expand them. Object > Expand

A new window pops up, select "OK"

FINISHED!