The Proto-Indo-European word *séhₐul
Word *séhₐul
Meaning sun
See also Homeric Greek: ἠέλιος ‘sun’
Avestan: huuar- ‘sun’

Comments
Lat. sōl, Lith. saulė, Ltv. saule, Welsh haul, Gk. hēlios, Alb. (h)yll, Eng. sigel/--; sunne/sun, OCS slunice, Russ. solnce, Skr. sūras, Av. hvarə, Gm. sunna/Sonne, ON sól; sunna, Goth. sauil; sunno, Welsh haul, Ir. súil/súil, Toch. swāñce/swāñco, Kamviri su, Polish słońce, Old Prussian saule, Pers. -farnah-/

Other words that might be of interest
*ar(e)-ĝ- ‘glittering, bright, white, fast’, *k̂euk- ‘burn, to shine, bright’, *dheu-1 ‘dust, smoke, vapor’, *bʰel- ‘light, bright’, *bʰer- ‘brown, shining’, *dʰel- ‘light’, *dhuh₂mós ‘smoke’, *ĝheim- ‘snow, winter’, *gʷʰh₂í- ‘bright, shining’, *h₂éhₓtr̥ ‘fire’, *h₁égni- ‘fire’, *h₂stḗr ‘star’, *h₃és-no- h₃és-i- ‘ash’, *leuk-; lóuk-o- ‘bright light’, *méh₁-nōt ‘moon, month’, *meldh- ‘lightning’, *nebʰ-o-, nebʰ-i- ‘cloud’, *sneigʷh- ‘snow’, *sneudh- ‘cloud, mist’, *temó- ‘dark’, *tón-r̥- ‘thunder’, *reudh- ‘light red’, *kwapor ‘smoke, steam, heat’, *péh₂ur ‘fire’, *h₂eidh- ‘kindle, ignite’, *bʰéh₂(e)s- ‘light’, *bʰéh₂tis ‘light’, *bʰel- ‘shine’, *bʰerhₓĝ- ‘shine, gleam’, *bʰleg- ‘shine, burn’, *dh(o)ngu- ‘dark’, *g(e)ulo- ‘fire, glowing coal’, *ĝher- ‘shine, glow’, *gʷhaidrós ‘bright, shining’, *h₃meigh- ‘drizzle, mist’, *h₄elh₁- ‘burn’, *hₐeidh- ‘burn, fire’, *hₐel- ‘burn’, *(hₐ)mauros ‘dark’, *(hₐ)merhₓgʷ- ‘dark’, *hₐewes- ‘shine’, *hₓn̥gʷnis ‘fire’, *kenhₓis ‘ash’, *kenk- ‘burn’, *ker- ‘burn’, *tómhₓes- ‘dark’, *wer- ‘burn’, *k̂ehₐu- ‘burn’, *kʷap- ‘seethe, smoke’, *k̂seh₁- ‘burn, singe’, *lap- ‘shine’, *leip- ‘light, cause to shine’, *leuk- ‘shine’, *mer- ‘shine, shimmer’, *merk- ‘darken’, *nébʰes- ‘mist, cloud, sky’, *(s)kand- ‘shine, glitter, moon’, *(s)koitrós ‘bright, clear’, *skótos ‘shadow, shade’, *sk̂ōyh̥a ‘shade’, *(s)m(e)ug(h)- ‘smoke’, *(s)plend- ‘shine’, *sweid- ‘shine’, *swer- ‘darken’, *ghromos ‘thunder, groan’, *h₂éhₓōs ‘ash’, *lóuk(es)- ‘light’, *louksnehₐ- ‘moon’, *leukós ‘light, bright, clear’, *(s)tenhₓ- ‘groan, thunder’