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I wasn't sure what you meant by finding CSV names. Here are two variants you can modify:

cd "$RESULT_DIR" && grep '\.csv$' "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

cd "$RESULT_DIR" && sed 's/$/.csv/' "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

Sorry for so many edits, I was working on something else while doing this. Hopefully something in here makes sense.

I think this does what you want. I assume the $NAMES file are filenames that need the .csv extension added then each one is grepped for the patterns.

cd "$RESULT_DIR" && sed 's/$/.csv/' "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

I wasn't sure what you meant by finding CSV names. Here are two variants you can modify:

cd "$RESULT_DIR" && grep '\.csv$' "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

cd "$RESULT_DIR" && cat "$NAMES" | xargs -I{} grep -Hf "$PATTERNS" "{}.csv" >> MatchingResults.txt 

I wasn't sure what you meant by finding CSV names. Here are two variants you can modify:

cd "$RESULT_DIR" && grep '\.csv$' "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

cd "$RESULT_DIR" && sed 's/$/.csv/' "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

Sorry for so many edits, I was working on something else while doing this. Hopefully something in here makes sense.

I wasn't sure what you meant by finding CSV names. Here are two variants you can modify:

cd "$RESULT_DIR" && grep '\.csv$' "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

cd "$RESULT_DIR" && cat "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

I wasn't sure what you meant by finding CSV names. Here are two variants you can modify:

cd "$RESULT_DIR" && grep '\.csv$' "$NAMES" | xargs grep -Hf "$PATTERNS" >> MatchingResults.txt 

cd "$RESULT_DIR" && cat "$NAMES" | xargs -I{} grep -Hf "$PATTERNS" "{}.csv" >> MatchingResults.txt