What is an 'old name' of data scientist? Terms like 'data science' and 'data scientist' are increasingly used these days.
Many companies are hiring 'data scientist'. But I don't think it's a completely new job.
Data have existed from the past and someone had to deal with data. 
I guess the term 'data scientist' becomes more popular because it sounds more fancy and 'sexy'
How were data scientists called in the past?
In reverse chronological order: data miner, statistician, (applied) mathematician.