Here are all the middle names used for Constantine found on the 1911 England and Wales census and cross-referenced with the CRBI.
Constantine Adolphus
Constantine Albert
Constantine Alec
Constantine Alexander
Constantine Alexis
Constantine Alfred
Constantine Anthony
Constantine Athanasius
Constantine Augustine
Constantine Augustus
Constantine Basil
Constantine Benjamin
Constantine Bernard
Constantine Bertram
Constantine Cecil
Constantine Characticus
Constantine Charles
Constantine Charles Joseph
Constantine Conrad
Constantine Cornelius
Constantine Cynric
Constantine Cyril G
Constantine David
Constantine Demetrius
Constantine Duncan
Constantine Edmund
Constantine Edward
Constantine Edwin
Constantine Elijah
Constantine Emmanuel
Constantine Eric
Constantine Ernest
Constantine Ethelbert
Constantine Eustace
Constantine Francis
Constantine Frank
Constantine Frederick
Constantine George
Constantine Hendrik Carl
Constantine Henri
Constantine Henry
Constantine Hugh
Constantine Hugo
Constantine Isaac
Constantine James
Constantine John
Constantine John Philip
Constantine Joseph
Constantine Joshua
Constantine Leonades
Constantine Lewis
Constantine Mathew
Constantine Michael
Constantine Nicholas
Constantine Paris
Constantine Patrick
Constantine Percival
Constantine Peter
Constantine Philip
Constantine Reginald
Constantine Richard
Constantine Robert
Constantine Spiro
Constantine Theodore
Constantine Thomas
Constantine Vincent
Constantine Walter
Constantine William
