That was my immediate thought, too. Fifteen? I could have asked, "when did that happen?" though in fact the answer is obvious: over the last fifteen years.

Your question reminds me of an exchange I had years ago with my cousin, who's always been like a little sister to me, at the birth of her first baby. She named her girl Sophie, which I really like as a name (even before reading Howl's Moving Castle) but it's not a name I had ever heard of in our family before. "Janine," I asked, "where did 'Sophie' come from?"

She looked at me very seriously. "Guy," she said, "if you don't know that by now, I'm not sure I am the one to tell you..."