What does this symbol mean

Hi,

I am going through the baptism registrations looking for a great great mother and have noticed a circle with an X in the middle next to some of the names, does anyone know what it means?

Example on page 57, first name Maria Ygnacia:

https://www.ancestry.com/interactive/60017/MM9.3.1_2FTH-1-18454-49109-48?backurl=https%3a%2f%2fsearch.ancestry.com%2fsearch%2fdb.aspx%3fdbid%3d60017%26path%3d&ssrc=&backlabel=ReturnBrowsing#?imageId=MM9.3.1_2FTH-1-18454-50718-28

Thank you,
Esther