Albertus = Albert or George
Adam (Ade) = Adam
Aedus = Hugh
Aemilia = Emily
Agna = Agnes, Nancy
Agneta = Agnes
Alanus = Alan
Albertus = Albert
Alesia, Alicia = Alice
Alfredus, Aluredus = Alfred
Alicia = Alice, Elsie, Alyssa
Alienora, Eleanora, Elianora = Eleanor
Aloisius = Aloysius, Louis, Luis
Aloysius = Aloysius or Lewis
Alvredus = Alfred
Amica, Amata, Amia = Amy
Anastasia = Anastasia or Nancy
Andreas = Andrew
Anna = Ann, Anne
Antonius = Anthony
Arcturus, Artorius, Arturus = Arthur
Audoenus, Audoinus, Oeneus, Oenus = Owen
Augustinus = Austin
Avelina = Evelyn
Bartholomeus = Bartholomew
Beatrix = Betteris, Beatrice
Benedicta (f.)= Benedict, Benet
Benedictus (m.) = Benedict, Benet
Bertrandus = Bertram
Brigida, Brigitta = Bridget, Brigid
Carolum, Carolus = Charles, Carl
Caterina, Katerina, Katharina = Catherine
Catharina = Catherine, Kathryn, Kathleen
Cecilia = Cisley, Cecily
Cecilius = Cecil
Christiana, Christina = Christine
Christophorus = Christopher
Constantia, Custancia = Constance
Daniele = Daniel
Denisia, Dionisia = Denise
Dionisius, Dionisius, Dionysius = Denis
Donatus = Duncan
Dorothea = Dorothy
Eadmundus, Edmundus = Edmund, Edmond
Eadwardus, Eduardus, Edwardus = Edward
Egidius = Giles
Lena = Helen, Ellen
Elias = Ellis
Elisabetha, Elizabetha = Elizabeth, Beth, Betty,
Erchenbaldus = Archibald
Eustachius = Eustace
Eva = Eve
Felicia = Felice
Francisca (f.) = Frances
Franciscus (m.) = Francis, Frank
Fridericus = Frederick
Georgius = George
Gerardus = Gerard
Gilebertus, Gislebertus = Gilbert
Giraldus, Geroldus = Gerald
Godefridus, Godefredus = Godfrey
Goisfridus, Gosfridus = Geoffrey
Gratia = Grace
Gualterus = Walter
Guglielmus, Gulielmus, Guilhelmus, Gulielmo, Gulielmum = William
Haraldus = Harold
Helena = Helen, Ellen, Nell, Aileen, Eileen
Henricum, Henricus = Henry
Henrietta = Henrietta or Harriet
Hereweccus, Herveius = Henry
Hieremias = Jeremiah
Honorah = Nora, Norah, (Jane, Jean, Joan!)
Honoria = Honour, Honor
Hugo = Hugh
Isabella = Isabel
Ioannes, Joannes, Joannis, Johannes, Johannis = John
Jacobus = James or Jacob
Joanna, Johanna = Joan, Jane, Jeanne, Jeanette, Joanne, Sinead, Siobhan
Johanna = Jane, Joan, Jean and Honora
Josephum = Joseph
Josias = Josiah
Laurencia, Laurencius, Laurentium = Laurence, Lawrence
Lucas = Luke
Ludovicus, Lodovicus = Lewis, Louis
Malachias = Malachy
Marcus = Mark, Marcus
Margareta, Margreta = Margaret
Margeria = Margery
Maria = Mary, Maureen, Molly, Marie
Maria Anna = Mary Ann, Marian, Marianne
Mariana = Marion
Martinus = Martin
Mathaeus, Mattheus, Mathias, Matthias = Matthew
Matilda, Matildis, Matillis = Matilda, Maud
Mauricius, Meuricius = Maurice
Michaelem = Michael
Milo = Miles
Moyses = Moses
Muriella, Miriela, Mirielda = Muriel
Oliva = Olive
Patricius, Patritius = Patrick
Petrus = Peter
Philippa, Philippe = Philip
Radulfus, Radulphus = Ralph
Randolphus = Randal, Randolph
Reginaldus = Reynold
Reimundus = Raymond
Ricardus = Richard, Dick
Rugerius = Roger, Rory
Samuelem = Samuel
Stephanus = Stephen
Theodoricus = Theodore, Derek
Thomasum = Thomas
Timotheus = Timothy
Tobias = Toby
Vincencius = Vincent
Willelmus, Guillelmus= William


Some Changes in Names seen in Registers

Helen is a name that is rarely seen in parish records that are written in English up to the late 19th century. This name is usually found as Ellen in Irish parish records that are written in Latin

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There are a few odd ones, namely Thomas, Jeremias, Barnabas, Adamus, which don't fit the rules and can be found in different forms.
Thoma filius Thomae : Thomas son of Thomas
Thomas filius Thome : Thomas son of Thomas
Adamus, filius Ade or Adam : Adam son of Adam

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The name Bridget usually follows the same form in baptismal records as it should in marriage records, i.e. Bridget is often written as Bridgetam in baptismal records whereas it should read Bridgeta

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