Wrennyn? Beautiful name! The only problem I see is that it can be very often considered as a girl's name. Wrennyn sounds absolutely like a girl's name. Like something created from
Wren, inspired maybe by Welsh girls names like Rhonwyn. That's like I see Wrennyn. But maybe he will go by
Elliot or he just won't have any problems with his first name.
Elliot is a very good name. Good for boy, middle-aged guy and for old man.