http://en.wikipedia.org/wiki/Howard_Gardner
He seems to have reached, independently, a system of "multiple intelligences" very similar to the socionics functions:
1.1 Bodily-Kinesthetic
1.2 Interpersonal
1.3 Linguistic
1.4 Logical-Mathematical
1.5 Naturalistic
1.6 Intrapersonal
1.7 Spatial
1.8 Musical
Which can perhaps be more or less correlated like this:
1.1 Bodily-Kinesthetic
1.2 Interpersonal
1.3 Linguistic
1.4 Logical-Mathematical
1.5 Naturalistic
1.6 Intrapersonal
1.7 Spatial
1.8 Musical
Not perfect correlations by any means, but it shows that people arrive at similar theories independently.