Uqba
Yes. Uqba is historically attested; the most famous bearer is Uqba ibn Nafiʿ, a 7th-century Arab commander involved in the early Muslim expansion into North Africa.
No. Uqba (عقبة) is not a Qurʾanic word used as a proper name in the Qurʾān; it is a lexical term and a historical personal name.
Literally it means 'a difficult pass' or 'steep ascent' and is used for mountain passes or challenging routes.
Uqba is uncommon in contemporary naming but remains documented in historical and regional traditions, especially in North Africa.
No. The name is a lexical Arabic term and a historical personal name without intrinsically problematic religious connotations; as always, local custom and family preference guide naming choices.