Exa
Dark
Sideræl
Musk
&
Techno
Mechanicus
Musk
(Kids)

In her
2022 Vanity
Fair
interview,
Grimes
revealed
she
and
Elon
privately
welcomed
a
baby
girl
via
surrogacy.

“Exa
is
a
reference
to
the
supercomputing
term
exaFLOPS
(the
ability
to
perform
1
quintillion
floating-point
operations
per
second),”
she
said. “Dark,
meanwhile,
is
the
unknown.
People
fear
it
but
truly
it’s
the
absence
of
photons.
Dark
matter
is
the
beautiful
mystery
of
our
universe.'”

Sideræl—pronounced “sigh-deer-ee-el”—is,
according
to
mom, “the
true
time
of
the
universe,
star
time,
deep
space
time,
not
our
relative
earth
time,”
and
a
nod
to
her
favorite

Lord
of
the
Rings
character,
Galadriel,
who “chooses
to
abdicate
the
ring.”

Walter
Isaacson
revealed
in
his
biography Elon
Musk
that
Exa
was
born
in
December
2021
via
surrogate.

The
book
also
stated
that
around
Father’s
Day
2022,
the
on-again,
off-again
couple
welcomed
a
child
named

Techno
Mechanicus,
nicknamed Tau,
also
via
surrogate.
The
biography
includes
a
photo,
dated
June
2022,
of
Elon
feeding
the
baby
boy.

Though
Grimes
would
prefer
other
salient
details
be
kept
private. “I
have
tried
begging
the
public
and
my
kids
dad
to
keep
them
offline,
and
I’ve
tried
legal
recourse,”
she
shared
on
social
media
in
2025. “The
state
of
my
children’s
lives
being
public
is
of
grave
concern
to
me
and
I
think
about
how
to
solve
this
every
day.
It’s
insane
to
me
that
theres
no
way
to
deal
with
this.”