My husband's name is Nacanieli (the 'c' makes the 'th' sound) which is the Fijian variant of
Nathaniel and his family calls him Naca which is the exact same sound as Natha (NAH-thah) so Natha could be a nick name. There is always
Nathan too. I call my husband
Nate because that's how he introduced himself to me and I prefer
Nate over anything else. The man has like a million nicknames I swear lol.