  We investigate whether the recently observed 2.6 $M_\odot$ compact object in
the gravitational-wave event GW190814 can be a bosonic dark matter admixed
compact star. By considering the three constraints in mass, radius and
stability of such an object, we find that if the dark matter is made of QCD
axions, their particle mass $m$ is constrained to a range that has already been
ruled out by the independent constraint imposed by the stellar-mass black hole
superradiance process. The 2.6 $M_\odot$ object can still be a neutron star
admixed with at least 2.0 $M_\odot$ of dark matter made of axion-like particles
(or even a pure axion-like particle star) if $2 \times 10^{-11}$ eV $\leq m
\leq 2.4 \times 10^{-11}$ eV ($2.9 \times 10^{-11}$ eV $\leq m \leq 3.2 \times
10^{-11}$ eV) and with decay constant $f \geq 8 \times 10^{17}$ GeV.
