Since you've put this in the categories Sesame Street and Family the answer for both is Yes.
Bert and Ernie in Sesame Street
and
Ernie the Giant Chicken who fights Peter periodically
what does significance mean?
I assume you mean "warthog." His name is Pumbaa (voiced by Ernie Sabella).
The character's name is Ernie Bishop. He was played by actor Frank Faylen. FYI, the Sesame Street characters Bert and Ernie got their names from the characters in "It's a Wonderful Life." (Bert was the cop.)
The giant chicken's name is Ernie.(His wife's name is Nicole)
Ernie Pantusso
Neither Bert nor Ernie weren't given last names, so nobody knows what their last names are.
His name is Ernie Davis - Here is his website www.ErnieDavis.me
Ernie Bieler's birth name is Ernestine Geisbiegler.
Ernie Coombs's birth name is Ernest Coombs.
Ernie Sabella's birth name is Ernest Sabella.
Ernie Sigley's birth name is Ernest Sigley.
Ernie Cousins's birth name is Ernest Cousin.
Ernie Cheesley's birth name is Ernest Sheesley.
Ernie Terrell's birth name is Ernest Terrell.
Ernie Wise's birth name is Wiseman, Ernest.
Ernie Pinckert's birth name is Erny Pinckert.
Ernie Mishens's birth name is Ernest Mishens.
Ernie McKone's birth name is Ernest McKone.