Toyan was a Vhnori who was deceased by 2371.
During the Vhnori transference ritual, Loria made a request of her husband – who, in fact, was Harry Kim – to say hello to Toyan. (VOY: "Emanations")
This character was only mentioned in dialogue.
Toyan might be the name of Loria's husband's father, who died over three years before 2371.