thank you for short listing my suggestion of Lisbon Lion Jack but it looks like your excellent suggestion Bam Bam is by far the most popular

out of all the on-line usernames David could have chosen he chose one that refers directly to the game in 1967 from which was born the proud nickname The Lisbon Lions

L for Lisbon 67 for 1967 C for Celtic

if used as malcolm suggested, L67C on the sleeves i think Lisbon Lion on his shirt would seem be a natural & logical addition to his on-line username

The venerable Wiggy suggests that if it was chosen David may have to spend a lot of time explaining his love of Celtic and reference to it in his nickname, i would suggest he would not find this a chore and as Celtic have a worldwide fanbase in over 80 different countries in excess of over 10 million, 1 million of which are in North American it may be more recognisable than he thinks

so although some excellent names have been put forward, for the reasons stated above my vote must still be

Lisbon Lion

bam bamm

for me also

xborox 

Wam bam ty mam

BAM BAM        4 sure

Jeremy AKA Spliffis