The survey was carried out amongst 4,000 employees.
A third of workers don't know the names of their colleagues.
A study of 4,000 employees found 33% don't the names of some of their co-workers.
The survey by McVitie's found those in the 18 to 24 age group were less likely to know their colleagues' names.
Founder of Happier At Work, Aoife O'Brien, says people should make an effort to know their co-workers:
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