Searchable Names Simple User Panel

I'm looking to create a simple user panel where a word can be entered and if found in a list (held on web server) the it autocompletes. Ideally something along the lines of displaying a line under the search box saying " YES [entered word] IS A MEMBER OF THE CLUB.

Basically as the person arrives at the club, their names is entered, if found it populates and informs the person entering the name:

Enter name here: [a box]

[TICK] Confirmed [the name] is a valid member.

The name list can…

Searchable Names Simple User Panel