From Clairejo's DP>
Long post, stay with me if you can, first a small insight into where this may have come from then my personal experiences.
In ancient Roman society, members of the nobilitas and usually males in particular were usually called by their first name through childhood (Which was often a regularly used family name) but upon reaching manhood would adopt their middle name which was a family name ie Gaius Julius Caesar.
Also to confuse the matter, often two brothers would be called the same name ie Gaius Caesar, but their middlenames would seperate them thus they would be known as their middle name. ie Marius and Julius. Marius would then create his own subfamily using the name Marius. The idea being that you could look down a line of first born male children with the same name in the records, easily located. The romans were fanatical record keepers throughout the late republic and the empire and in order to be traced though ones family line was important.
Looking at the infamous Gaius Julius Caesar, he was named after his father. Gaius Julius Caesar (the elder) who had a brother called Sextus Julius Caesar and a sister called Julia Caeasris. Gaius Julius Caesar's father also shared the name as did his father. One could come to the reasonable conclusion that the name Gaius Julius Caesar gos back a very long way before the infamous conqueror of the late republic. Caesar himself had a daughter called Julia, and adopted his grand nephew as his son in his will who took Gaius Julius Caesar as his name. The name seems to die there as GJ Caesar never had a legitimate male heir. The name Caesar lived on and became a name for all emperors of the roman empire and the name evolved into the word for king in several european coutries (Tzar in Russia and Kaiser in Germany)
So without dismissing it as silly, using a middle name as a calling name can mean a lot to a family where a first name is important. In my family the first name Christopher is used for the first born son, my eldest brother, Father and Grandfather have this as their first name and use/d their middle names for calling. My other brother and I use our middle names too.
I am the youngest of three boys and when my first son was born I wanted to start my own line but figured it wouldn't make much sense as it would have to be the third son of the third son to ramain true to the pattern, so instead I gave my first son the choice to start his own by naming him after his paternal Grandpa and turning John into Jonathan and he gets called his middle name which is my first name -Martyn. By the time my middle son was born my eldest brother had had two daughters and had no plans for any more so it looked like the name Christopher would end in a line here so I decided to use that as my second sons first name and we call him Matthew, which bears no family history other than we found out my cousin used this name for his son but we didn't know on each others part. For my third son we decided that two non family names would be appropriate and would open up a larger pool of names should the following generations wish to name after people in the family. I sonetimes get riddiculed for keeping to the family tradition and both of my brothers have stated at that should they have sons they doubt they will continue it but I thought it was something important to me to do. Yes it can be confusing and a pain sometimes, but it is probably directly responsible for giving me a great confidence to speak to people from correcting people on school register time to visits to the doctor. Some times I let it go, for instance when boarding aeroplanes I am unlikely to meet the person again so I let them call me Martyn, but in other situations it is a great ice breaker and a good topic of conversation. I have fond memories as a child having it all explained to me time and time again and instilled a great respect for my family history and a great respect for other peoples differences in general.
Thanks for taking the time to read and I hope it has opened the topic up for debate. The roman history is not 100% fact as I can't find sources for it other than Wikipedia which is even more contradictory than this post and is based upon my understanding from enjoyment of studying this culture.