Standardizing the spelling of players' names is very important for the practical usefulness of a database. All functions which refer to players rely on the standardized spelling. The large databases offered by ChessBase – the Big and Mega Databases – have been meticulously edited and all the players's names are correct.
The best way to standardize names is to make use of the player encyclopedia. You can do this very easily when saving games: simply type in a few letter of the name and then click the "?" button.
ChessBase will retrieve the player you want from the encyclopedia.