Help! Name on ticket missing a letter.

I would not worry about it,very much doubt it would be picked up and as long as the surname is correct you will be fine.

They have the right to refuse you onboard if the names don't tally. Your risk.

I don't see anybody at Berlin airport not knowing that Steve and Steven are the same.

The Germans have enough trouble with names like for example Müller (the most common German surname). Many foreign (non-German) airline websites will not accept the letter ü, so they enter the name as Mueller - the correct alternative according to German spelling rules. Then they get to some airport in the USA to fly back and get queried because it says Müller on the passport and Mueller on the ticket.

It is probably not a problem. I have travelled frequently with tickets made out to Jack, although on my passport it is John. W.

Recently had my middle-name merged onto my first name. Not an issue.

Also in advance inadvertently entered my wife's passport number with two numbers transposed to the airline, easily fixed at check-in.

Sam W might be a problem but Steve or Steven is not. The last name needs to be accurate to the letter unless very obvious for the difference. From time to time I have had the k dropped on my first name - Fran instead of Frank. I think it is a computer thing. No need to worry.

I have an unusual last name where the letters D and O are often switched and it hasn't been an issue.