"It is customary for a Church of England Bishop or Archbishop to sign himself with his given name and the (usually abbreviated) Latin name of his See - in this case "Ebor:" which is an abbreviation of Eboracum, the Latin name for York. The present archbishop has chosen to sign himself "Sentamu Ebor" instead of "John Ebor" because Sentamu is in fact not his surname but another given name (in Uganda surnames (family names) are uncommon, most people simply having several given names, often one from Christian tradition and one from Ugandan, which can be used interchangeably)."
"The surname of the Archbishop of Canterbury is not always used in formal documents; often only the first name and see are mentioned. The archbishop is legally entitled to sign his name as "Cantuar" (from the Latin for Canterbury). The right to use only a title as a legal signature is only permitted to bishops, Peers of the Realm and peers by courtesy. The current Archbishop of Canterbury usually signs as "+ Rowan Cantuar".
An archbishop or bishop, in writing his signature, substitutes for his surname the name of his see; thus the prelates of Canterbury, York, Oxford, London, &c., subscribe themselves with their initials (Christian names only), followed by Cantuar., Ebor., Oxon., Londin. (sometimes London.)
its all i coujld find. guess you might have to look up each bishop/archb to determine their designation.
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