BUG - pd.concat with all Series on axis=1 ignores the `names` argument (Issue: 23490)
State: closed

- [x] closes #23490
- [x] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Fix issue described in #23490, and add tests to catch this case.

Labels:
name: Bug
name: Reshaping
description: Concat, Merge/Join, Stack/Unstack, Explode

Comments:
Hello @ArtinSarraf! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/core/reshape/concat.py`](https://github.com/ArtinSarraf/pandas/blob/3346f7fd37b6985027867d110d82b61d8d9cd95c/pandas/core/reshape/concat.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/test_concat.py`](https://github.com/ArtinSarraf/pandas/blob/3346f7fd37b6985027867d110d82b61d8d9cd95c/pandas/tests/reshape/test_concat.py) !


@gfyoung - Is there a way to rerun the Travis CI build? I get the following error in the logs, and it doesn't seem to be explicitly related to any of my changes.

"No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated"
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23499?src=pr&el=h1) Report
> Merging [#23499](https://codecov.io/gh/pandas-dev/pandas/pull/23499?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/24ab22f75aae1c9b9491c26e6f753814b7d6fd8e?src=pr&el=desc) will **increase** coverage by `0.02%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/23499/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23499?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #23499      +/-   ##
==========================================
+ Coverage   92.23%   92.25%   +0.02%     
==========================================
  Files         161      161              
  Lines       51197    51169      -28     
==========================================
- Hits        47220    47207      -13     
+ Misses       3977     3962      -15
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.64% <100%> (+0.02%)` | :arrow_up: |
| #single | `42.28% <0%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/23499?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/reshape/concat.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcmVzaGFwZS9jb25jYXQucHk=) | `97.6% <100%> (ø)` | :arrow_up: |
| [pandas/core/tools/timedeltas.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvdG9vbHMvdGltZWRlbHRhcy5weQ==) | `98.18% <0%> (-0.24%)` | :arrow_down: |
| [pandas/core/indexes/timedeltas.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy90aW1lZGVsdGFzLnB5) | `90.71% <0%> (-0.03%)` | :arrow_down: |
| [pandas/core/arrays/datetimelike.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL2RhdGV0aW1lbGlrZS5weQ==) | `96.09% <0%> (-0.02%)` | :arrow_down: |
| [pandas/core/strings.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3RyaW5ncy5weQ==) | `98.58% <0%> (ø)` | :arrow_up: |
| [pandas/core/indexes/datetimes.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9kYXRldGltZXMucHk=) | `96.41% <0%> (ø)` | :arrow_up: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.03% <0%> (ø)` | :arrow_up: |
| [pandas/util/\_test\_decorators.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvX3Rlc3RfZGVjb3JhdG9ycy5weQ==) | `93.24% <0%> (ø)` | :arrow_up: |
| [pandas/core/groupby/generic.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ3JvdXBieS9nZW5lcmljLnB5) | `87.04% <0%> (ø)` | :arrow_up: |
| [pandas/core/arrays/period.py](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL3BlcmlvZC5weQ==) | `98.08% <0%> (ø)` | :arrow_up: |
| ... and [2 more](https://codecov.io/gh/pandas-dev/pandas/pull/23499/diff?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23499?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23499?src=pr&el=footer). Last update [24ab22f...3e624e8](https://codecov.io/gh/pandas-dev/pandas/pull/23499?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

great. ping on green.
Thanks @ArtinSarraf !