alakh niranjan

Wikipedia gave the meaning of this Mantra as: "Alakh means "that which is not seen" and niranjan means "without any stains.".

It is implied that 'alakh' is a derivative of the Sanskrit word 'alakshya', the opposite of 'lakshya'. 'lakshya' is taken to mean 'target' or 'goal' but literally it could perhaps mean 'an object being seen'. 'Anjana' is a black stone (guess, with a high antimony content) and could also mean 'black spot' or 'stain'.

So 'niranjana' could mean 'stainless', 'pure' that is.So, the mantra could just be the join of two attributes of the divine: 'invisible' ('subtle'?) and 'pure'.But there is another derivation possible: 'Alakh' could well be derived from 'Allah'. so, 'Alakh Niranjan' could mean the full declaration: "God is Pure(Purity)".

And this derivation actually seems likelier than the earlier one - the Mantra is popular in and probably originated in Punjab and Sindh and the popular religion of both regions has been a remarkably syncretic mix of Hinduism and Islam for well over a Millennium (Sikhism is of course, the most remarkable of the many - often overlapping - movements which crystallized from this mix of faiths and beliefs).

And phonetically, the sounds 'ha' and 'kha' are close and interchangeable, so 'Allah' could very naturally have gone to 'Alakh'.