I just stumbled across this little story which I'd saved on my computer, can't remember where I got it from but I must have thought it was interesting enough to have kept it. Hope you enjoy reading it as much as I did.
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Welsh Names

A 1949 English movie, "A Run for Your Money", about a pair of Welsh coal
miners who win a trip to London to see a Wales vs. England rugby match,
includes a comic scene in which a railway station master pages one of the
heroes on the public address system, calling "Mr. David Jones from Wales,
please come to the station master's office." At least a hundred arriving
passengers (except our hero) all swarm into the station master's office.
This comedic situation was possible because of the many duplicate names to be
found among the Welsh, a common source of confusion in researching Welsh
lineage. In addition, variant spellings, pseudonyms and other naming
practices are traps for the unwary.

Lol, Similar situation in Northern Ireland when my father visited his distant cousins.to show off his cousin(a policeman) walked him into the pub and shouted for John Hazel 12 lads stood up not including his own son.

pseudonyms and other naming

.... Dai the Steam was probably the driver of that train. Back in the village they left John the Box at the undertakers, etc etc

http://news.bbc.co.uk/1/hi/wales/south_east/6112714.stm