Common Christian names for boys include: Aaron, Ethan, Jacob, Joseph, Matthew, Mark, Samuel, and Seth. Common Christian names for girls include: Hannah, Leah, Mary, Rachel, Ruth, and Sarah.
Well the names in the bible are common, like John, Joseph, Mary, Peter, Luke, James, Lucas, Mark, Maria and Micheal those are the most common names. You can also put Christian as a name for a boy or a girl. It doesn't have to be common though, you can put Zechariah, or Ezekiel, just consult the bible.
Noel, Joshua, Emmanuel, Ezekiel, James, Matthew, Mark, Luke, John, Ezra, Neimiah, Jeremiah, Job, Jacob, David, John, Jonah, Joseph -- Most of these are books of the bible or main people from stories. You can also consider names of disciples.