what causes a name to go "out of fashion" ?

I don't know what made me think of this, but I have realized recently that there are so many names that are just not being given to the next generation anymore. Growing up, my friends and acquaintances had names like Jeannie, Heather, Tracy, Linda, Wanda, Jane, Erin, and Kathy. I know of absolutely no children with those names.

My aunts and uncles (many of whom are now deceased) had names like Marjorie, Jean, Gwen, David, and Boyd. Again, I know of no children with those names.

However, my paternal grandmother's name was Olive and I know many small Olivias. My maternal grandmother's name was Emma, and again, I know many young Emmas. I'm not sure if I could say the same about the grandfathers: Walter and Milton.

If we wait long enough will those popular names of the 60's and early 70's come back in style? Are names now determined by tv personalities or other form of celebrity? By what were names influenced in the 1920's when my parents were born? Were they more determined by continuing a family name?

I have noticed now that names sometimes have different spelling than the traditional form. Is that a way of making your child unique (or just creating a hassle every time someone tries to spell their name)?  I was a firm believer in naming our children something that would suit them at any age. I do wonder about some names that are cute for little ones, but will they seem a bit ridiculous as that person becomes an adult, later in life?

What about you? Is your name still in use or has it gone out of style?