Why is it called blowjob?

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Sucking is known as blowjob. In French "faire une pipe" in German it is called "blasen" or "französisch". The word blowjob sounds a bit weird because a blowjob has nothing to do at all with blowing. Nothing would happen if you try to blow a cock. I have tried to find out something about the origins of the word blowjob. Originally a  blowjob has been called below job. In the Victorian period women of higher ranks refused to give a below job because of their social positioning. So the gentlemen had to find other women for the below job. But this kind of women were not able to pronounce this term correct. Perhaps you remember the musical "My fair Lady". The whole musical is about the social question of that time. Women of working classes spoke in a different way. Even today it is very important to the British people how to speak. So the below job became a blowjob. The word blowjob is slang. It is interesting to me that it was a below job. That points out that you could do everything with the cock whilst being below. The blowjob wouldn't only work by putting a cock in a mouth and that's it. It is important to play with the balls ("ball sucking") and some other parts "below".