Why? For many reasons, but I'll give you the short version:
I know one
Dylan (outside of the TV screen), and he is, well, different. But a great guy nonetheless.
The meaning - I love the water, and "great sea" is nice in my water-loving opinion.
And certainly not least, I LOATHE
Liam. I disliked it when I first heard it (as a nn for
William) but understood that
Will was too popular for the parents to like. But on its own, I detest it even more. There is no appeal to me. Even if I could talk you into using full name
William (which I adore) with
Liam as a nn, I would prefer simply
Dylan.