Our ultimate Maula is Allah but the word is also used for human maulas in the Quran as well.
16:76 وَضَرَبَ ٱللَّهُ مَثَلاً۬ رَّجُلَيۡنِ أَحَدُهُمَآ أَبۡڪَمُ لَا يَقۡدِرُ عَلَىٰ شَىۡءٍ۬ وَهُوَ ڪَلٌّ عَلَىٰ مَوۡلَٮٰهُ أَيۡنَمَا يُوَجِّههُّ لَا يَأۡتِ بِخَيۡرٍۖ هَلۡ يَسۡتَوِى هُوَ وَمَن يَأۡمُرُ بِٱلۡعَدۡلِۙ وَهُوَ عَلَىٰ صِرَٲطٍ۬ مُّسۡتَقِيمٍ۬
God gives you another example of two men. One of them is he whose faculties of speech and mind are disabled. He cannot do anything of his own accord and he is wholly dependent on his care-provider, unable to bring forth any good. Can such a one be equal to the man who is fit, enjoins justice and himself walks the straight path?
44:41 يَوۡمَ لَا يُغۡنِى مَوۡلًى عَن مَّوۡلً۬ى شَيۡـًٔ۬ا وَلَا هُمۡ يُنصَرُونَ
The Day when no friend shall be of any avail to his friend, and none shall be helped.