Alphabetizing names--OCD symptom?

Ever since I was about 6, I have been making lists of names. I would find a class roster and I would write all of the names of other students in my class out, divide them into categories, etc. and then alphabetize them again. I did this all throughout elementary school, and in middle school I began just making up names and putting them into alphabetized lists. I probably had over 1000 made-up names and I had them all in order. I think it was at its worst about 2 years ago, when I entered all of them into an Excel spreadsheet and was messing around with all the categories. Now that I have been at college it has not been bad, but whenever I get bored while at home I tend to do this. Is this OCD?