Changing previous duplicate line in awk - linux

Question

I want to change all duplicate names in .csv to unique, but after finding duplicate I cannot reach previous line, because it's already printed. I've tried to save all lines in array and print them in End section, but it doesn't work and I don't understand how to access specific field in this array (two-dimensional array isn't supported in awk?).
sample input
...,9,phone,...
...,43,book,...
...,27,apple,...
...,85,hook,...
...,43,phone,...
desired output
...,9,phone9,...
...,43,book,...
...,27,apple,...
...,85,hook,...
...,43,phone43,...
My attempt ($2 - id field, $3 - name field)
BEGIN{
FS=","
OFS=","
marker=777
}
{
if (names[$3] == marker) {
$3 = $3 $2
#Attempt to change previous duplicate
results[nameLines[$3]]=$3 id[$3]
}
names[$3] = marker
id[$3] = $2
nameLines[$3] = NR
results[NR] = $0
}
END{
#it prints some numbers, not saved lines
for(result in results)
print result
}

Answer 1

Here is single pass awk that stores all records in buffer:
awk -F, '
{
rec[NR] = $0
++fq[$3]
}
END {
for (i=1; i<=NR; ++i) {
n = split(rec[i], a, /,/)
if (fq[a[3]] > 1)
a[3] = a[3] a[2]
for (k=1; k<=n; ++k)
printf "%s", a[k] (k < n ? FS : ORS)
}
}' file
...,9,phone9,...
...,43,book,...
...,27,apple,...
...,85,hook,...
...,43,phone43,...

Answer 2

This could be easily done in 2 pass Input_file in awk where we need not to create 2 dimensional arrays in it. With your shown samples written in GNU awk.
awk '
BEGIN{FS=OFS=","}
FNR==NR{
arr1[$3]++
next
}
{
$3=(arr1[$3]>1?$3 $2:$3)
}
1
' Input_file Input_file
Output will be as follows:
...,9,phone9,...
...,43,book,...
...,27,apple,...
...,85,hook,...
...,43,phone43,...