Latin entries in Baptismal records at NLI

The given name Alexander came very late to both Ireland and Scotland, and is of course not of Gaelic origin.  Queen Margaret (originally a Saxon) introduced it to Scotland, as the mother of the Scottish King Alexander I.  It arrived in Ireland with the Normans at around the same time.  It was often Gaelicized in both Ireland and Scotland as Alsander, Alastar, and sometimes Alastrann or Alastrom.  It was later re-anglicized as Alexander or in forms such as Alick/Alec or Alasdair/Alister (which are also considered nicknames for Alexander, as is the name Sandy).  For a child already being called Alexander by its family, a priest or government official would probably have considered that a perfectly anglicized or classical name, and would not have changed it, though he might have decided to change Alick or Alasdair to Alexander.