For instance my surname is pronounced something like ----esi, where s not the English noun s like "sun", but rather the German sch like schön.
When I pronounce my name, and somebody wants to write it down, there is room for mis-spelling in writing due to heritage variants, the following are all possible and pronounced almost identically: ----esi, ----esy, ----essi, ----essy. The same applies for surnames ending --asi (--asy, --assi, --assy) and a lot of other endings.
If a name ends like "vary", then if somebody else writes your name, then it is also possible to write it as "vari". The vari is the common one (means that somebody is from a location where there's a castle, "var" is castle, "vari" is something like a "Berliner" in German, if Berlin would also mean castle ), the "vary" is a bit archaic.
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