  We report the first observation of the processes $e^+e^-\to\Upsilon(\rm
1S,2S)\eta$ at $\sqrt{s}=10.866$~GeV with a $10.2\sigma$ and $16.5\sigma$
significance respectively. The measured Born cross sections are $\sigma(e^+e^-
\to \Upsilon(2S)\eta)=2.07 \pm 0.21 \pm 0.19$~pb, and $\sigma(e^+e^- \to
\Upsilon(\rm 1S)\eta)=0.42 \pm 0.08 \pm 0.04$~pb. We also set the upper limit
on the cross section of the process $e^+e^- \to \Upsilon(\rm 1S)\eta^{\prime}$
to be $\sigma(e^+e^- \to \Upsilon(\rm 1S)\eta^{\prime})<0.035$~pb at $90\%$ CL.
The results are obtained with the data sample collected with the Belle detector
at the KEKB asymmetric-energy $e^+e^-$ collider in the energy range from
$10.63$~GeV to $11.02$~GeV.
