“Manaha Jinanam” usually refers to “Manah Jinanam Sajjay”, a Jain stavan/stuti recited mainly in Śvetāmbara Mūrtipūjak tradition, especially around Pratikraman / Chaityavandan / special bhakti programs.

In simple words:

• It is a devotional hymn in praise of the Jinas (Tirthankars).
• The word “Manah” = mind, and “Jinanam” = of the Jinas.

Main meanings / bhāv covered in this stuti (in traditional explanations):

1. Right faith and right path

- Leave wrong beliefs and wrong paths. - Take refuge in the Jin-shāsan (teachings of the Tirthankars).

1. Focus of the mind

- Keep the mind steady in dharma – not running behind sensual pleasures. - Turn the mind again and again towards samyak darshan, samyak jñān, samyak chāritra.

1. Praise of Jina qualities

- Infinite knowledge, infinite perception, total non-attachment (vītarāgata), compassion, purity. - By remembering these, we purify our own inner tendencies.

1. Daily spiritual discipline

- Encourages regular sādhana: - pratikraman, - samayik, - prarthanā / stavan, - vrata, upvas, etc. - Message: only continuous practice leads towards liberation.

1. Protection from inner enemies

- It prays for freedom from anger, pride, deceit, greed, and from wrong company & wrong thoughts. - The “protection” is not miracle-based; it is through following Jina’s path.

Digambar / Śvetāmbara note

• “Manah Jinanam Sajjay” in this form is primarily a Śvetāmbara Mūrtipūjak stuti, used in their pathshala books and Pratikraman compilations.
• Digambar tradition has many other stavans and sutras with similar bhāv, but generally does not use this particular stuti in its standard nityakram.

Since you wrote only the name, I have explained its overall sense and use. If you want, we can next go verse-by-verse bhāv-arth (meaning line by line) in very simple Hindi/English, without going into difficult grammar.