Did Columbus find a sponsor in Italy to finance his voyage?
"About half of the financing was to come from private Italian investors, whom Columbus had already lined up."
Because he was working at the time for the King of Spain, who had financed and authorised his voyage. Even if he wasn't, there was no such country as Italy at the time. Christopher Columbus was a citizen of the Republic of Genoa (Italian: Repubblica di Genova), but Genoa refused to sponsor the voyage. His actual name was: Cristoforo Colombo; in Italian and Cristóbal Colón; in Spanish.
Recent research shows he was Spanish. He wrote in Spanish and spoke Spanish. His wife was Spanish. Columbus wasn't Spanish. He was born in Genoa Italy. However no one in Italy would finance his voyage so he was forced to go elsewhere to get funding, his most famous voyage to the Caribbean (West Indies) being financed by Spain.
Probably not. Columbus wasn't Spanish; he was born in or near Genoa, in what is now Italy. He had first proposed his voyage to the Indies to Genoese authorities, but they declined to sponsor him. However, there's a good probability that many of Columbus' Spanish crew members were Jews who were fleeing the Spanish persecutions during the expulsion from Spain.
Spain. Columbus was Spanish and it is a myth he was from Italy. He wrote in Spanish and was married to a Spanish noble woman. If he had been an Italian map maker he would not have written in Spanish nor would have been married to a noble. Historians believe that his family were rivals of the Spanish court so Columbus took a persona to be able to get the backing he needed for his…
The newest research on Columbus actually shows that he was Spanish and not Italian. He wrote only in Spanish and spoke only Spanish. His wife was Spanish nobility. Historians think that Columbus took on the persona of an Italian because his family in Spain were not friends with the crown and he knew he wouldn't be able to get funding for his voyage if he kept his real identity.
Christopher Columbus had no right to claim Italy. It was ruled by a number of dynasties and republics that had established ruling groups. As a result there was no mechanism for him to claim Italy. If the question intends to ask Why didn't Christopher Columbus claim his discovery for Italy?, please see the Related Question.