Maybe there was a psychological reason for him picking this name. Reynolds was extrinsically motivated. He wanted the wealth crime gave him but he also craved adulation. There was kudos is being a flash dresser. He reviled the upper class but also imitated them. He was a Marxist he said but wanted his son to attend Harrow as Churchill had been there.
Reynolds felt a profound sense of inadequacy. Yes, he was a revolting excuse for a man/ He stole from the working class. He broke into the homes of elderly couple with his gang, tied up old people and terrorised them till they revealed where their valuables were.
In his biyhood Reynolds was self conscious about wearing glasses. He overcame this embarrassment a little because Glen Miller the big band leader wore them/
When living Under a false identity in the late 60s Reynolds used the name Clement Miller. Miller was the surname of his idol. Clement sounds like Glen. The hard C and the hard G are almost the same. The L is there in both names as the second letter. Then there is the E in the third position in both Christian names. N and M are as similar as can be without being the actual same sound. Perhaps this was an unconscious homage to G Miller. This may have been another sign o Reynolds being desperate for validation. It was not just status symbols that he hankered after. Good riddance to the vicious old parasite.