There are various legends behind some of these. Fanny Adams was a young girl murdered in gruesome circumstances in Portsmouth, mid C19. As a result, naval tinned meat of the day became called 'Fanny Adams', and so presumably by association, containers made of tin.
I served with 'Dinger' Bell & 'Spud' Murphy both 'D's (probably more correctly Fighter Controllers!). The First Lieutenant is always the 'Jimmy', the Navigator often 'Vasco'. When there were real weapons (that went bang) on Ships the Officer i/c was 'Guns'