It is almost always that the most important thing on moving to a place with different types of names and wishing to merge in or otherwise choose a name that might be acceptable, is to retain the Initial letters of the Given Name and of the Family Name. Therefore, in these examples the M remains. As an example; i was in Amsterdam looking for my Great-grandfather known in England as Henry and an Archivist said that was not a Dutch name, try Hartog. I did and up came my ancestor's. file reference.
From: main@... <main@...> on behalf of Sally Bruckheimer via groups.jewishgen.org <sallybruc=yahoo.com@...>
Sent: 14 March 2021 20:26
To: main@... <main@...>
Subject: Re: [JewishGen.org] Name of MARKUS to Max #lithuania #names
Markus or Max were typically men with the Hebrew name Mordechai, Moses would be a second choice, but anything is possible. Sometimes a man with whatever Hebrew name might choose to call himself something totally unrelated in English or another language.