Surtr

As defined by the Cleasby & Vigfusson Old Norse to English dictionary:

surtr Old Norse word can mean:

surtr

m., gen. surts and surtar, [svartr], the Black, the name of a fire-giant, the world-destroyer, Vsp. 52, 54, Vþm. 17, 18; Surta(r)-logi, the flame of Surt, the last destruction of the world by fire, Vþm. 50: curious is the phrase, gott er þá á Gimli með Surti, Edda (Cod. UpS. ii. 292). surtar-brandr, m. ‘surts-brand,’ is the common Icel. word for jet, see Eggert Itin. The word is found on vellum MS. of Bret. (1849) 116, and is therefore old, and interesting because the name of the mythical fire-giant and destroyer is applied to the prehistoric fire as a kind of heathen geological term.

surtr

2. in local names; Hellinn Surts (mod. Surts-hellir) is the name of the famous cave in Icel.; hellinn Surts, Sturl. ii. 181; hann fór upp til hellisins Surts ok færði þar drápu þá er hann hafði ort um jötuninn í hellinum, Landn. 199.

surtr

II. a nickname and pr. name, Landn.

surtr

2. the name of a black dog. surtar-epli, n., botan. ‘Surt’s apple,’ the pod or capsule of an equisetum, Eggert Itin. 434.

Possible runic inscription in Younger Futhark:ᛋᚢᚱᛏᚱ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements