Commentary
Charles Cawley: "The Codex de Roda names "Sanzio Garseanis et Scemeno Garseanis" as the children of "Garsea Scemenonis" and his second wife "domna Dadildi de Paliares soror Regimundi comitis", one manuscript stating that Sancho was "cognomento Avarca"."

The "Medieval Iberia Readings from Christian, Muslim, and Jewish Sources" by Olivia R. Constable, places Sancho Garces I, King of Navarre from 905 as the son of Fotun Garces (d 905), who was the son of Garcia Iniguez (d 870), who was the son of Inigo Iniguez (d 851), who was presumably the son of another Inigo.
Family
ClaimDetailEvidence
FatherGarcia Jimenez II, King of Pamplona (e842-) [S930]
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MotherDadildis de Pallars (e843-) [S930]
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Spouse 2ndToda Aznarez de Larraun (~885-) 
Child +Sancha Sanchez de Navarra (>900-~955) [S930] [S931]
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Child +Garcia Sanchez III, King of Navarre (~919-970) [S930] [S958]
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Child +Lupe Sanchez (e906-) [S906] [S930]
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Attributes
ClaimDetailEvidence
GenderMale
NameSancho Garcia [S930]
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NameSancho I King of Navarre [S930]
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NameSancho I Garces King of Navarre [S931]
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NameSancho Garces I, King of Navarre [S906] [S930] [S958]
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NameSancho Garcia I, King of Navarre
no source
FatherGarcia Jimenez II, King of Pamplona (e842-) [S930]
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MotherDadildis de Pallars (e843-) [S930]
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Timeline
ClaimDateDetailAgeEvidence
Birthabt 865Spain [S930]
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Birthabt 880 [S930]
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Title905King of Navarre [S930]
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DeathDec 11, 925 [S930]
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Sources
IndexTitle
[S906] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Gascony)" (2006-7 (v1.3 Updated 05 August 2007)) (https://fmg.ac/Projects/MedLands/GASCONY.htm).
[S930] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Navarre Kings)" (2006-7 (v1.2 Updated 19 August 2007)) (https://fmg.ac/Projects/MedLands/NAVARRE.htm).
[S931] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Kings of Castille & Leon)" (2006-7 (v1.2 Updated 25 August 2007)) (https://fmg.ac/Projects/MedLands/CASTILE.htm).
[S958] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Aragon Kings)" (2006-7 (v1.1 Updated 19 August 2007)).