List of buyers for each product

Goto your wordpress phpmyadmin open database

1.All Woocommerce orders save in table-prefix_posts table

2.and Woocommerce order’s meta info like :billing-addres,customer-name store in table-prefix_postmeta table

run SQL command in phpmyadmin

SELECT * 
FROM  `table-prefix_postmeta` 
WHERE  `post_id` = any order-id
LIMIT 0 , 30

you get list of product meta info.

_order_items

this meta-key store all product info which your customer order

Logic:

1.Retrieve all meta info in WordPress Loop(WP_Query).

2.check if your required product id in _order_items.if it is their, then print your customer name _billing_first_name or other info.

Important Link:

WordPress Database Description

Get Post Meta