Consuming haraam

Q: If a person were to consume haraam food eg. a chocolate without any doubt or without knowledge that it contains haraam, would a person's imaan be weakened? Similarly eating take aways.

The name "Raju"

Q: A male whose name is Raju, what does the name Raju mean? Is it permissible to keep the name or should the name Raju be changed because I
heard Raju is a Hindu name?

The name "Alayna"

Q: Is it permissible to keep the name alayna الينة as in the root ل ي ن not علينا the preposition. Alayna is derived from layyinah which is mentioned in surah taha. Alayna is also mentioned in surah yaseen. Is Aleena or liyana suitable names?