I've one tree with families who seem particularly keen on using surnames as middle names, such as Millgate, Redman, Wyborn, Clayson. Usually it helps with searches, but with the usual repeated fornames, I have 3 Edward Millgate ARCHERs, & 4 Richard Redman ARCHERs.
One lucky man was given 6 forenames, 2 of which are surnames - Richard Redman Samuel William George Abbott ARCHER.
Annoyingly my 4xGt grandfather was a Thomas MILGATE (one L) but I haven't (yet) found a connection with the other tree.