🔼The name Malcam in the Bible
The name Malcam is applied to only one man in the Bible, although it is spelled the same as the name Milcom (also known as Malcam — Jeremiah 49:1-3, although some translations interpret מלכם here as "their king" — and perhaps also known as Molech), the main deity of Ammon, just pronounced slightly different.
Malcam the man was a son of Shaharaim and his wife Hodesh (1 Chronicles 8:9). They lived in Moab, where the god Milcom or Molech was worshipped, and it's pretty safe to conclude that Malcam was named after Milcom.
🔼Etymology of the name Malcam
The name Malcam comes from the noun מלך (melek), meaning king:
Where the added letter mem comes from isn't immediately clear. It could be due to a direct transliteration of the Moabite name for their deity, and it doesn't actually mean anything in Hebrew.
Alfred Jones (Dictionary of Old Testament Proper Names) deems the names Malcam and Milcom intensitive forms of our noun מלך (melek), and translates Malcam with Most High King (and Milcom with just "High King", curiously enough).
The final mem could even designate the masculine plural pronominal suffix, and the names Malcam and Milcom could be meant to mean Their King. This is the interpretation favored by NOBSE Study Bible Name List. BDB Theological Dictionary does not interpret these names.