A quick browse through the Trademark Electronic Search System (TESS) shows 3 "live" trademarks for the term "wiki".
Kimball International, Inc for office furniture
Richmond Wholesale Meat Co
Wiki LLC for motorcycle helmets Face shields for motorcycle helmets & Protective clothing
yes it is trademarked by hasbro
Yes. This is a patented, trademarked product.
No it is not trademarked. It is just an extrememly common phrase for weddings mostly, but the phrase itself "save the date" is not trademarked
Yes they can, if they belong to a certain company or ownership they can be trademarked.
It is already a movie and a TV series.
Yes. Several instances of "Fortune 500" are trademarked by Time Inc
No
oxymizer
Yes it is.
yesh it isith
nintendo
Ragdoll