Yes, doubling characters or numbers is common in Chinese to insist on the item.

At weddings, you will see lots of double happiness characters for example.

“Everybody” is literally the character for people that is repeated, so “yan yan”.

I like to use https://searx.neocities.org/ It randomises your search across several searx instances. It’s not always reliable as some instances are sometimes down or exceed request limit. But retrying often works. Worst case i use mojeek or ddg