The original Ottawa Senators were named in the early 1900s, back when there were teams like the Victoria Shamrocks, Vancouver Millionaires and Montreal Maroons. Names weren't vicious and menacing like they are now. When the new Ottawa team started in 1993, the consensus choice was to resurrect the Senators nickname.
The stupidest nicknames are names that have nothing to do with their city. The Utah Jazz started as the New Orleans Jazz. The name Jazz makes sense with New Orleans, but I don't know of many jazz musicians in Utah. Same goes with the Los Angeles Lakers which started in Minneapolis. The only lakes in or near Los Angeles are swimming pools!
Another one is the Arizona Cardinals of football,made sense in St. Louis but not in Arizona.