Kafeel comes from the root kaaf-faa-laam, which points to three main meanings.

1.The first meaning is to guarantee, to be surety and witness,
2. the second is to take charge of
3.The third main meaning is be entrusted with the care of something.

This root appears 10 times in the Quran in five derived forms.

Examples of these forms include 
yakfulu (“takes charge [of]”),
kiflun (“a portion”) and
al-khifli (“Dhul Kifl”).
 

Linguistically the kafeel of someone else is the person who takes someone under his or her care and takes responsibility for that person.
 

Al-Kafeel is the one and only creator, who takes ultimate responsibility for the complete creation, taking care of all affairs, fulfilling His oaths, and witnessing all oaths made by others!

 

Allah calls Himself Kafeel— Guarantor, Surety— once in the Quran. Al-Kafeel is the only one able to protect the interests of the whole creation. He is the guarantor of all oaths, and He guarantees all material and spiritual provisions according to His wisdom. He is the best surety in the affairs of all!