What is the first note in 6th position on the cello's A string called?

I don’t really understand the question, but I’ll take a guess.
If the “positions” are a half-step apart (like frets on a fretted instrument) then the sixth position on an A string would be D#.
Apologies if I’ve misunderstood your question; I don’t play cello.

Hi koanhead, thank you for the response. I ask the question, because the notes in 6th position actually defy this logic of the half-steps from F (on the second-from-top line, part of the bass-clef most cello music is written in) because notes in the 6th position are notated in C-clef (tenor) thus starting with “C” on the on the second-from-top line—I keep psyching myself out, about what note this really is… check this out http://www.celloonline.com/cellofingeringchart.htm

What string are you on?

The A string

You are right! It is ‘G’!