It's not really 'silent', just pronounced differently to English (and a modifier to the 'd' rather than its own letter). gāñdhī is the transliteration of गांधी

It's not really 'silent', just pronounced differently to English (and a modifier to the 'd' rather than its own letter). gāñdhī is the transliteration of गांधी (correct name) vs. gāñdī looks like गांदी, and द is not pronounced like ध (which is is kind of a softer, more aspirated 'd'). (The ā, ñ, ī and similar 'accents' more often dropped in transliteration than the aspirative 'h' - I added them above just for accuracy, to talk purely of the d/dh, using the IAST standard for transliteration. But 'nobody' uses this for texting Hindi on qwerty. (And as someone learning the language the resulting ambiguity and variation is frustrating!))