It's a full name on its own in two different origins (Old Irish, "fair, white"; & Old Norse, originally "wanderer", now "Sámi/Lapp", and metaphorically "magician"), but there are several longer names that can also lend themselves to a Finn nickname.
- Alfinn (AHL-finn, Norwegian)--"elf Sámi"
- Arnfinn (ARN-fin, Norwegian)--"eagle Sámi". Another form is Anfinn (AHN-fin).
- Audfinn (OWD-fin, [archaic] Norwegian)--"wealth Sámi"
- Bergfinn (BEHRG-fin, Norwegian)--"fortress Sámi"
- Eldfinn (ELD-fin, [archaic] Norwegian)--"fire Sámi"
- Elffin (EL-fin, Welsh [mythology])--poss. from Latin or Pictish "white". Also spelled Elphin.
- Finbar (FIN-bar, Irish)--"fair head"
- Finlay (FIN-lee, Irish, Scottish, English)--"fair warrior". Also spelled Finley. [unisex in the U.S., but exclusively masculine elsewhere]
- Finlo (FIN-loh, Manx)--"fair Lugh" [Irish god]
- Finnegan (FIN-eh-gan, Irish [surname])--"little fair one"
- Finnegas (FIN-eh-gas, Irish [mythology])--poss. "Finn the Seer". Also written as Finegas or Finneces.
- Finnian (FIN-ee-an, Irish)--"fair, white". Other forms include Finnán (FIN-awn) and Finnén (FIN-ayn).
- Finnleif (FIN-life, Norwegian)--"Sámi-heir". An older form is Finnleiv (FIN-live).
- Finnvid (FIN-vid, [somewhat archaic] Swedish)--"Sámi-tree". Other forms include Finnevid (FIN-eh-vid, also somewhat archaic Swedish), Finnved (FIN-ved, archaic Norwegian), and Finwith (FIN-vit, old Danish, old Swedish)
- Finnulf (FIN-ulf, [archaic] Norwegian)--"Sámi wolf". Also spelled Finulf.
- Finnur (FIN-nur, Icelandic)--form of Finn (the Old Norse one, not the Irish ;) )
- Finnvald (FIN-vahld, [archaic] Norwegian)--"Sámi-ruler"
- Fintan (FIN-tan, Irish)--poss. "white bull" or "white fire"
- Fiorenzo (fee-oh-REN-tsoh, Italian)--form of Florence
- Franklin (FRANK-lin, English)--from Old English, "free man"
- Geirfinn (GIRE-fin, Norwegian)--"spear Sámi"
- Griffin (GRIF-fin, English)--anglicized form of Welsh Gruffudd, poss. "strong prince"; or from the mythological creature
- Kolfinn (KOHL-fin, [slightly archaic] Norwegian)--"dark Sámi"
- Norfinn (NOR-fin, [slightly archaic] Norwegian)--"north Sámi"
- Philemon (fye-LEE-mon, fil-EE-mon, English; fee-LAY-mohn, [Biblical] Greek)--from ancient Greek, "affectionate, kind"
- Philion (FIL-ee-on, FYE-lee-on, [Anglicized, ancient] Greek)--prob. "beloved". Also spelled Phileon.
- Phineas (FIN-ee-as, English)--from Hellenized Hebrew, meaning uncertain. Also spelled Phinehas.
- Phinias (FIN-ee-as, [Anglicized, ancient] Greek)--poss. "vulture", or a form of Phineas
- Phinus (FIN-us, [Anglicized, ancient] Greek)--poss. "vulture"
- Phintias (FIN-tee-as, [Anglicized, ancient] Greek)--poss. "dearest". Other forms include Phintas, Phinteas, and Phinton.
- Seraphin (SEHR-ah-fin, English; SEHR-ah-feen, German)--masculine of Seraphina. Spanish form is Serafín (seh-rah-FEEN).
- Tophinus (TOH-fin-us, [Anglicized, ancient] Greek)--poss. "tuff" [a volcanic rock]
- Torfinn (TOR-fin, Norwegian)--"Thor-Sámi". Also spelled Thorfinn.