What made you choose that name, CathMom, if I may be so bold as to ask?
Long story.
I'll try to make it short, though.
Please keep in mind that, when we first had children, we were not Christians, much less Catholics.
My husband and I grew up with very common names, so I was always called my name and my last initial. So was he. We hated it. So when we started having children it became really important that our children didn't have very common names.
Over the years, we've developed some other weird naming rules, like no to people with the same phonetic sounds...
When you get to child #7, it gets harder. This time, we thought we'd try to have both names saint names. We had first thought of Charlotte, but little Charlotte's started popping up everywhere around here. So we ruled it out at the last minute.
Then we found Merryn. There is some confusion about St. Merryn, but more than likely he was a man, also know as St. Mirin or Mirren. In anycase, he went through Celtic Ireland and Scotland converting the pagans.
We thought, in this modern time of such huge pagan influence, having St. Merryn as a protector would be useful.
We opted for the feminine version of Mirren which is Merryn.
Also, we just like Irish/Scottish/Celtic names.