could get interesting with passports. etc :) are you so and so? No I am so and so ..oh who is this then? thats so and so and so. sheesh might all end up with simple numbers and a letter or 3 . like postcodes ..they dont read addresses on envelopes until it gets into a posties hand.. machines sort mail and just read codes. so all your passport would need ( as it does already) is an identifying code. so we could introduce a couple as say ..this is AZQ129 and partner ApT 678 . try remembering that! bad enough trying to recall your PIN numbers lol .alternative will be a simply chip ( as in pets) under skin say in wrist.then we can scan ..ID gets shown and no matter if your Ponsonby -Smith or Sarah Wedgwood-Barrelbox etc