I am assuming that by "championships in pro sports", we are referring to the NBA, NFL, NHL and MLB. Since the NFL is the youngster here all of it's teams can be eliminated immediately. In the NBA, Boston has 21 championship appearances winning 17. The Lakers have 31 championship appearances but have only won 15 of those. ( +1 to the winner of the current series). The NHL is dominated by Montreal with 34 championship appearances, winning 24 of those. But the most championship appearances by any pro sports team is 40 by the New York Yankees who have won 27 championships.
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Bill Russel with 11 NBA Championships. and one other professional athlete has 11
Henry Richard of the Montreal Canadians is the other one......he has won 11 Stanley Cups.
In Spain, Real Madrid have won 32 La Liga championships.
In North America, the New York Yankees have won 27 MLB championships and the Montreal Canadiens have won 24 NHL championships.
Kobe Bryant has the Most championships and awards in playing Basketball he plays for the lakers