Behavior of gold as hydrogen in certain gold compounds and a very recent experimental report on the noble gas–noble metal interaction in Ar complexes of mixed Au–Ag trimers have motivated us to investigate the effect of hydrogen doping on the Ng–Au (Ng = Ar, Kr, and Xe) bonding through various ab initio based techniques. The calculated results show considerable strengthening of the Ng–Au bond in terms of bond length, bond energy, stretching vibrational frequency, and force constant. Particularly, an exceptional enhancement of Ar–Au bonding strength has been observed in ArAuH₂⁺ species as compared to that in ArAu₃⁺ system, as revealed from the CCSD(T) calculated Ar–Au bond energy value of 32 and 72 kJ mol^–1 for ArAu₃⁺ and ArAuH₂⁺, respectively. In the calculated IR spectra, the Ar–Au stretching frequency is blue-shifted by 65% in going from ArAu₃⁺ to ArAuH₂⁺ species. Similar trends have been obtained in the case of all Ar, Kr, and Xe complexes with Ag and Cu trimers. Among all the NgM_3–kH_k⁺ complexes (where k = 0–2), the strongest binding in NgMH₂⁺ complex is attributed to significant enhancement in the covalent characteristics of the Ng–M bond and considerable increase in charge-induced dipole interaction, as shown from the topological analysis.